I just installed the first N800 update which was released on the 23rd. I tested to see if flash is faster but I can't see/feel it, the browser seems to be faster.
Two problems I really wanted to be fixed got fixed: the DUMMY IAP and the Metalayer-crawler problem (I had this fixed myself, but it is nice that it now just works).
I wonder if USB host mode is supported in this release. I need to find some time to check it out.