How will you be able to chart Overdrive/Band Unisons in this game? ANSWER: They are placed in the MIDI file used to chart the songs in the first place (by you, of course).
Also, sometimes certain actions are preset to happen on certain songs (i.e. the whole band sans drummer jumps up in the air when you scream 'Yeeeeaaaaah!' in Won't Get Fooled Again), will you be able to map these as well? ANSWER: Yes.
How will the game lip-sync the songs? ANSWER: Magma lip-syncs it for you.
Can you get the other band members to sing as well (backup vocals)? ANSWER: Yes, Magma also lip-syncs these.
How will the star cutoffs be worked out? ANSWER: By the number of notes you have in the track and how many band members are playing.
Who do you think's gonna win Pop Idol? ANSWER: Who gives a crap? Take an ego-puff point if you know the reference.
Any possible timeframe for getting this out to other countries? (i.e. UK) ANSWER: Lol, like with Rock Band 1? You wish. (Still need a proper answer for this!)
Will people that don't have RBN yet released in their country (i.e. UK) still be able to playtest songs, and buy them? ANSWER: Yes.
Will you need a XNA account to review songs?