migration-guides: add Blacksail release note templates

diff --git a/documentation/migration-guides/index.rst b/documentation/migration-guides/index.rst
index f71144dd3..e53215c73 100644
--- a/documentation/migration-guides/index.rst
+++ b/documentation/migration-guides/index.rst
@@ -12,6 +12,7 @@  to move to one release of the Yocto Project from the previous one.
 .. toctree::
 
    migration-general
+   release-6.1
    release-6.0
    release-5.3
    release-5.2
diff --git a/documentation/migration-guides/migration-6.1.rst b/documentation/migration-guides/migration-6.1.rst
new file mode 100644
index 000000000..2e103f0b7
--- /dev/null
+++ b/documentation/migration-guides/migration-6.1.rst
@@ -0,0 +1,47 @@ 
+.. SPDX-License-Identifier: CC-BY-SA-2.0-UK
+
+.. |yocto-codename| replace:: blacksail
+.. |yocto-ver| replace:: 6.1
+.. Note: anchors id below cannot contain substitutions so replace them with the
+   value of |yocto-ver| above.
+
+Migration notes for |yocto-ver| (|yocto-codename|)
+**************************************************
+
+This section provides migration information for moving to the Yocto
+Project |yocto-ver| Release (codename "|yocto-codename|") from the prior release.
+For a list of new features and enhancements, see the
+:doc:`/migration-guides/release-notes-6.1` section.
+
+Supported kernel versions
+-------------------------
+
+The :term:`OLDEST_KERNEL` setting is XXX in this release, meaning that
+out the box, older kernels are not supported. See :ref:`4.3 migration notes
+<migration-4.3-supported-kernel-versions>` for details.
+
+Supported distributions
+-----------------------
+
+Compared to the previous releases, running BitBake is supported on new
+GNU/Linux distributions:
+
+-  XXX
+
+On the other hand, some earlier distributions are no longer supported:
+
+-  XXX
+
+See :ref:`all supported distributions <system-requirements-supported-distros>`.
+
+Removed recipes
+---------------
+
+Removed :term:`PACKAGECONFIG` options
+-------------------------------------
+
+Removed classes
+---------------
+
+Miscellaneous changes
+---------------------
diff --git a/documentation/migration-guides/release-6.1.rst b/documentation/migration-guides/release-6.1.rst
new file mode 100644
index 000000000..f238a26d4
--- /dev/null
+++ b/documentation/migration-guides/release-6.1.rst
@@ -0,0 +1,10 @@ 
+.. SPDX-License-Identifier: CC-BY-SA-2.0-UK
+
+***********************
+Release 6.1 (blacksail)
+***********************
+
+.. toctree::
+
+   release-notes-6.1
+   migration-6.1
diff --git a/documentation/migration-guides/release-notes-6.1.rst b/documentation/migration-guides/release-notes-6.1.rst
new file mode 100644
index 000000000..c101ddcfa
--- /dev/null
+++ b/documentation/migration-guides/release-notes-6.1.rst
@@ -0,0 +1,113 @@ 
+.. SPDX-License-Identifier: CC-BY-SA-2.0-UK
+
+.. |yocto-codename| replace:: blacksail
+.. |yocto-ver| replace:: 6.1
+.. Note: anchors id below cannot contain substitutions so replace them with the
+   value of |yocto-ver| above.
+
+Release notes for |yocto-ver| (|yocto-codename|)
+================================================
+
+This document lists new features and enhancements for the Yocto Project
+|yocto-ver| Release (codename "|yocto-codename|"). For a list of breaking
+changes and migration guides, see the :doc:`/migration-guides/migration-6.1`
+section.
+
+New Features / Enhancements in |yocto-ver|
+------------------------------------------
+
+-  Linux kernel XXX, gcc XXX, glibc XXX, LLVM XXX, and over XXX other
+   recipe upgrades
+
+..
+   Found in meta/classes-global/sanity.bbclass:check_sanity_everybuild
+
+-  Minimum Python version required on the host: XXX.
+
+-  Kernel-related changes:
+
+-  New core recipes:
+
+-  New core classes:
+
+-  New variables:
+
+-  Global configuration changes:
+
+-  BitBake changes:
+
+-  QEMU / ``runqemu`` changes:
+
+-  Documentation changes:
+
+-  Go changes:
+
+-  Rust changes:
+
+-  Wic Image Creator changes:
+
+-  Testing-related changes:
+
+-  Utility script changes:classes
+
+-  Clang/LLVM related changes:
+
+-  SPDX-related changes:
+
+-  Patchtest-related changes:
+
+-  :ref:`ref-classes-insane` / :ref:`ref-classes-sanity` classes related changes:
+
+-  Security changes:
+
+-  :ref:`ref-classes-sbom-cve-check`-related changes:
+
+-  New :term:`PACKAGECONFIG` options for individual recipes:
+
+-  systemd related changes:
+
+-  U-Boot related changes:
+
+-  Miscellaneous changes:
+
+Known Issues in |yocto-ver|
+---------------------------
+
+Recipe License changes in |yocto-ver|
+-------------------------------------
+
+..
+   Going through commits on OE-Core filtered by License-Update:
+   git log -U0 --patch --grep "License-Update:" yocto-6.0..origin/master
+
+Security Fixes in |yocto-ver|
+-----------------------------
+
+..
+   Generated with documentation/tools/gen-cve-release-notes
+
+Recipe Upgrades in |yocto-ver|
+------------------------------
+
+..
+   Generated with https://layers.openembedded.org/layerindex/branch_comparison
+   With "rST" output selected
+
+Contributors to |yocto-ver|
+---------------------------
+
+..
+   List obtained with the following shell snippet:
+
+      authors=""
+      for repo in openembedded-core yocto-docs bitbake meta-yocto; do
+         authors="${authors}\n$(git --no-pager -C $repo log --format="-  %an" yocto-6.0..origin/master)"
+      done
+      echo $authors | sort | uniq
+
+   Email addresses and duplicates removed.
+
+Thanks to the following people who contributed to this release:
+
+Repositories / Downloads for Yocto-|yocto-ver|
+----------------------------------------------