SD-DVDs still need some work -- i.e., it will get even better. It will be interesting to see whether any of the problems are found here before the fixes get released.

Blu-Ray playback should be the bees knees with this firmware. If you are calibrating your video, RECHECK THAT, as well as rechecking any decisions you might have made as to the best choice for video output format and Deep Color settings.
There are still bugs being worked on. As usual, Beta testers are limited in what they can say. But honestly, this firmware should be a big improvement for folks over the original pre-release firmware.
--Bob