Well, we knew already about Harmattan-MeeGo. If you want to call that PR 2.0 / Maemo 6 you can, but at the end of the day for the N900 users its still useless because community-Harmattan-MeeGo for the N900 will be stripped down so no phone, no Skype, no Flash. Could it be retrofitted? Maybe, but I guess it all depends on who sticks around until then. If Nokia decides to spend the effort to get PR 2.0 on the N900 I'd be ecstatic. Not holding my breath though. They've made no indication that that will happen.
Calls in NITDroid are working (the actual sound in the call is being worked on) and I believe a member on the MeeGo forum (he is also a member here) made calls on MeeGo for N900.
It was made clear that the Harmattan "Hackers Edition"/community edition would have the closed bits working and included. Meaning Skype, Flash 10.1, Maps, etc etc, all working. With all the tmo FUD threads, it isn't hard to miss this, so I won't blame you all =P Still, that won't be available until the Harmattan SDK beta releases, so MeeGo handset reference UX should get our focus.
They're maemo and MeeGo... "Meamo!" sounds like what Zorro would say to catherine zeta jones... after she slaps him for looking at her dirtily...