Dirge of Cerberus Explanations and clarifications

I'll be the first one to post here, asking a few questions. We can make this the place for any questions regarding the game until its international release:

-What do we know about Doc?
-How does the title come in to play?
-Is it true Vincent and Cait Sith are the only playable characters?
-What kind of game will this be?

These are the few things that I need to know. Anyone else feel free to ask

TSG

1:No clue
2:the name is to be cool.
3:I didn't know u could even play as Sith.
4:It's a first person shooter which can switch between first and third person, instead of there being random battles.

Dirge of Cerberus comes out on August 22!!!!!!!!!!!!!!!!!

I hope you can find satisfactional answers here: http://en.wikipedia.org/wiki/Dirge_of_Cerberus

Be careful though, for it has spoilers of unknown levels. One thing I do know though. . .

Shalua Rui is one gorgeous-looking cyborg.

Vincents voice-over?

I don't want to spoil this game ... never mind then.