Release Notes for v1.4 (#1676)

docs/Release.md

@@ -40,9 +40,10 @@ This table describes all MsQuic releases, both officially supported (LTSC or SAC
 | [Type](Release.md#release-support-policies) | Branch | Windows | Fork Date | Release Date | End of Support |
 | -- | -- | -- | -- | -- | -- |
 | LTSC | [release/1.0](https://github.com/microsoft/msquic/tree/release/1.0) | Server 2022 | Nov 13 2020 | Jan 5 2021 | Jan 4 2026 |
-| TBD | [release/1.1](https://github.com/microsoft/msquic/tree/release/1.1) | TBD | Feb 10 2020 | TBD | TBD |
-| PRE | [prerelease/1.2](https://github.com/microsoft/msquic/tree/prerelease/1.2) | N/A | Mar 26 2020 | N/A |N/A |
-| PRE | [prerelease/1.3](https://github.com/microsoft/msquic/tree/prerelease/1.3) | N/A | Apr 27 2020 | N/A |N/A |
+| TBD | [release/1.1](https://github.com/microsoft/msquic/tree/release/1.1) | TBD | Feb 10 2021 | TBD | TBD |
+| PRE | [prerelease/1.2](https://github.com/microsoft/msquic/tree/prerelease/1.2) | N/A | Mar 26 2021 | N/A |N/A |
+| PRE | [prerelease/1.3](https://github.com/microsoft/msquic/tree/prerelease/1.3) | N/A | Apr 27 2021 | N/A |N/A |
+| PRE | [prerelease/1.4](https://github.com/microsoft/msquic/tree/prerelease/1.4) | N/A | Jun 1 2021 | N/A |N/A |
 
 <br>\* Future **Release Dates** are subject to change.
 <br>\** **End of Support** dates do not include possible [extended support](https://docs.microsoft.com/en-us/windows-server/get-started-19/servicing-channels-19#long-term-servicing-channel-ltsc) extensions.
@@ -124,3 +125,27 @@ The QUIC specifications are still in RFC editor queue. Both the v1 and draft-29
 - Refactored/improved WPA plugin and cmd line tool, QuicTrace (#1482, #1484, #1485, #1490, #1493, #1499).
 
 The QUIC specifications are being actively looked at by the RFC editor. Both the v1 and draft-29 versions are still supported by this release.
+
+## MsQuic v1.4 (Prerelease)
+
+**Not officially supported**
+
+[MsQuic v1.4](https://github.com/microsoft/msquic/releases/tag/v1.4.0) has numerous improvements from v1.3. As this is a prerelease, there is no expected shipping vehicle for this release. Some noted changes in this release include:
+
+- Updated User Mode PGO.
+- Perf improvement from sent packet metadata stream ref counting (#1529).
+- Support address sanitizer on Windows.
+- Random allocation test support for SpinQuic and BVT (#1537, #1541).
+- Fix key phase and key update detection logic (#1548).
+- Fixed bug with stateless reset and retired CIDs (#1568).
+- Add support for Peer Accept Stream event (#1560).
+- Various bug fixes found from random allocation failure tests.
+- Various additional test cases added.
+- Added multiple API version support.
+- Lots of improved documentation.
+- Enabled ACK frequency in CPU limited scenarios (#1588).
+- Support for DPLPMTUD (#1563).
+- Reduced min MTU to 1248 (#1673).
+- Refactored POSIX error codes (breaking change for POSIX, #1645).
+
+The QUIC specifications now offically RFC. Both the v1 and draft-29 versions are still supported by this release.