Small update:
Install went fine, no surprises, general usage is smooth. No idea yet about power consumption / battery liftetime yet though.
Had to completely redo all E-Mail accounts after backup restore (however, this might be an old one, I remember having that already too when setting up my old V2)
Not unexpected but to be noted: Camera is dead.
Since I never had this situation before- since this is a beta release, will an update be possible or do I have to redo/flash the entire phone again for each update a new?