Stigy, the XDA thread you posted is very interesting - are you still following it? They're saying that the update includes a new bootloader, new radios, a new boot animation (wonder what it looks like!), and some kind of app/database optimizer
- not sure exactly what that last part means.
Anyway, I wonder if all this can be extracted and incorporated into existing ROMs? This thread
over at Rootz for the new radios seems to generally have people getting a little bump in reception and data.