Well, I didn't try video yet, but someone stated that quadrant is workin, so I'm assuming the h264 problems are gone, so it should be fine.
For anyone wondering, it's still based on the Asus build, the screen density seems it may have been lowered (looks like something between 100 and 120, but I haven't checked the build.prop yet) there are still issues, at least with YouTube, in portrait (I honestly don't think there is a screen density that will fix these issues - at least not at 480x800. I'm beginning to think that Honeycomb was never meant for 480x800, unless Dell releases a build.)
RC2.5 is a very good build, but because of the portrait issues, I keep it locked in landscape, only unlocking it to move homescreen icons. This is easily the best Honeycomb build since Honeystreak 1.0 RC3 (my favorite build.)