sadly, no
No, Santa does not come in Minecraft. There is no Santa mob or anything special that happens around Christmas, although sometimes Mojang temporarily implements a special little thing e.g Christmas themed chests.
You Cant
No, Minecraft is a program.
Soon.
Minecraft was originally released to the public in 2009.
It won't, next is minecraft 2.0.
Minecraft Alpha came out in 2009.
If you are referring to Minecraft: Pocket Edition, it is unknown.
Yes, Multiplayer comes with Minecraft on the PC.
It will never come out for Wii.
Absolutely, Santa will be there.
In Minecraft PE the horses will come soon since the pocket edition will soon get that update.