In the interview on this map pack with Jimmy Zelinski, this question was asked:
1oS: Why is Rezurrection misspelled? Is there significance to that?
JZ: You never know where hints and Easter eggs may appear in Zombies. What looks like a typo may be a typo but it might also be the hidden truth behind everything.

So my guess is we are either Resurrecting and the "Z" symbolizes the Cosmic Silverback OR the Z has to do with one or more of the EE steps

If it is that we are resurrecting someone than who is it????
If Samantha lived Richtofen's Scheme at Der Reise, than Dr. Maxis might have to, which would leave that resurrection question more of a mystery, but we could be returning Samantha into human form or just resurrecting Maxis to attempt to save his Daughter (Samantha)

Questions/Comments?