afaik available at the systems (M5 for maemo and MG1 for MeeGo1.0)
running core to X: M5 MG1
UX: M5
Full Qt4.6: M5-PR1.2 MG1
call/sms: M5
videocall: M5-PR1.2
...
it is the bare system, just the development core, nothing special nothing new not even old stuff! It is a complete fresh start and you do not need it!

I honestly don't know why everybody is freaking out about it. The first proper release is said to be about 6 Month after MG1.0 not Weeks!

For issues like charging the device or if wifi is working and other hardware stuff wait for it being released and we all will see!