Nope. Its 100% local. No online at all.
No, no and yes. The first two Assassins Creed's are not online. But the newest one, on Xbox 360 and PlayStation3, Assassins Creed Brotherhood, is online where you can assassinate online people while they try and assassinate you. So this answer depends on which Assassins Creed you are talking about.
no
Yes.
no it does not have online play
Yes, Aslong as you have a working games console that plays assassins creed 2 then you can still play assassins creed 2 as it has NO online gameplay what so ever, If this dosent continue to work, Contact Ubisoft
No. Assassins Creed Brotherhood- Codex Edition will only be available online.
no but i wish
No, it is only for the phone
They are the exact same games but I am going to say ps3 because in AC brotherhood when playing online you need to pay for LIVE on Xbox but on PS3 it is free.
For Assassins Creed 1 No, for Assassins Creed 2 yes.
No
there is no demo