Updated my Rpi2 yesterday.
Problems seen so far:
- similar do these ( Raspberry Pi 3B+ h264 1080i hardware deinterlacing broken?, rpi4 audio/video issues when attempting to stream live TV ) deinterlacing with MMAL Advanced forces audio/video out of sync after a few seconds. Workaround is switching to MMAL Bob or disabling deinterlacing.
- this ( Overclocking partially broken with DVFS firmware · Issue #1290 · raspberrypi/firmware · GitHub ) breaks gpu / h264 overclocking and with it playing 1080p 60fps videos on Rpi2. Stock 250Mhz are not sufficient for this, but 300MHz did the trick for me until now.