Release Notes for upcoming prerelease/1.3 (microsoft#1523)

docs/Release.md

@@ -42,6 +42,7 @@ This table describes all MsQuic releases, both officially supported (LTSC or SAC
 | LTSC | [release/1.0](https://github.com/microsoft/msquic/tree/release/1.0) | Nov 13 2020 | Jan 5 2021 | Jan 4 2026 |
 | TBD | [release/1.1](https://github.com/microsoft/msquic/tree/release/1.1) | Feb 10 2020 | TBD | TBD |
 | PRE | [prerelease/1.2](https://github.com/microsoft/msquic/tree/prerelease/1.2) | Mar 26 2020 | N/A |N/A |
+| PRE | [prerelease/1.3](https://github.com/microsoft/msquic/tree/prerelease/1.3) | Apr 27 2020 | 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.
@@ -91,3 +92,27 @@ The QUIC specifications have been approved by the IESG and are in RFC editor que
 - Support for pkcs12 imports
 
 The QUIC specifications are still in RFC editor queue. Both the v1 and draft-29 versions are still supported by this release.
+
+## MsQuic v1.3 (Prerelease)
+
+**Not officially supported**
+
+[MsQuic v1.3](https://github.com/microsoft/msquic/releases/tag/v1.3.0) has numerous improvements from v1.2. As this is a prerelease, there is no expected shipping vehicle for this release. Some noted changes in this release include:
+
+- Removed old/unused `mitls` and `stub` TLS providers. Only `schannel` and `openssl` are officially supported (#1398, #1411).
+- Fully support Resumption and 0-RTT with OpenSSL (#1469).
+- Fully support Windows UWP apps (#1429, #1452, #1454).
+- Support Client certificate validation (#1366).
+- Support ChaCha20-Poly1305 with OpenSSL (#1431).
+- Support Cipher Suite allow-list (#1430).
+- Support Portable Certificate verification (#1450).
+- Various performance improvements (tune recv pkt queue, worker partition ID for send, UDP send queuing) (#1424, #1448, #1451, #1456, #1474, #1483).
+- Fixed SO_REUSEPORT perf issue on server sockets (Linux only) (#1391).
+- Fixed various issues with macOS (arm platform detection, max CPU count) (#1388, #1427).
+- Fixes bugs that causes stream to get in (temporary) bad state when aborting receive path (#1513, #1516).
+- Update `StreamShutdown` to run inline on callbacks (#1521).
+- Support universal binaries for macOS (#1414).
+- Added/updated documentation, especially around trouble shooting (#1423, #1467, #1481, #1486).
+- 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.