I have just installed it so I'm not up to date on all its new features, here is what I do notice:
1. Dont bother with its support for .docx, .pptx, ect. It just doesn't work right. It does open them but the files are not formatted correctly at all. Not a deal breaker though because it does relatively ok with the older ms formats.
2. They updated the icons, a few interface tweaks, and they finally included a few templates in the ppt clone. Those simple templates will save some people a lot of hassle.(they are kinda ugly, but its better than nothing).
3. It seems to be loading a lot faster. Which is a good thing.
Thats my impression so far. I haven't tried any of the other big features yet.