docs: Update docs for v4.12 release (#7567)

maintained-branches.md

@@ -2,8 +2,8 @@
 
 We are currently maintaining the following branches of Shaka Player:
 
- - v4.11 (latest)
- - v4.10 (previous)
+ - v4.12 (latest)
+ - v4.11 (previous)
  - v4.9 (in use by the Cast Application Framework)
  - No active LTS branches at this time
 

roadmap.md

@@ -16,10 +16,17 @@ Candidate features for future release cycles:
  - Predict next segment in DASH SegmentTimeline
    https://github.com/shaka-project/shaka-player/issues/898
  - Smaller, more modular binary
+ - CMCD v2
 
 v5.0
  - Conversion to Typescript
 
+v4.13 - 2025 Q1
+ - Time ID3, emsg, and metadata events to the presentation timeline
+   https://github.com/shaka-project/shaka-player/issues/7556
+
+=====
+
 v4.12 - 2024 Q4
  - Performance improvements
  - HLS - Make dummy streams for tags representing muxed audio
@@ -28,8 +35,6 @@ v4.12 - 2024 Q4
    https://github.com/shaka-project/shaka-player/issues/5022
  - DASH compatibility with FairPlay
 
-=====
-
 v4.11 - 2024 Q3
  - HLS: EXT-X-START support
  - HLS: EXT-X-I-FRAME-STREAM-INF support