No, that's not a typo. They're actually calling this film "Genisys," either to avoid confusion with the Phil Collins band or to not-so-subtly reference Cyberdyne Systems - the company that creates Skynet. Probably that second one, but it's still the worst title we've seen in a long time, and we see 'Batman v. Superman: Dawn of Justice' on pretty much an hourly basis these days. Like, it would be SLIGHTLY better if it were "Genesys." At least it would only be misspelling one part of the word. There's no reason for that "i" in "Genisys."
Maybe it's a subtle nod to rebellion against computer overlords, since Microsoft Word would flip its goddamn shit if it saw you trying to spell "genesis" like that.