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There is currently no definite end to Left 4 Dead 2. The game is still at the same point it was when it was released, all of the DLCs take place somewhere between the Parish, and the Passing.
4 players can play in Left 4 Dead 2.
It is a Key that will unlock the Left 4 Dead 2 in your steam library
Yes there is split screen for left 4 dead 2.
You can purchase The Sacrifice DLC for Left 4 Dead 2, which has you play as characters from the first game. Additionally, you can put character skins of the original characters onto the characters of Left 4 Dead 2 (Only in the PC version)