Then why call it anything other than "Jumanji 2" if it is a direct sequal? more to the point who was crying out for a Jumanji sequal of all things? Jumanji SUCKS!
"I'm the Dude! That's what you call me, you know... That or His Dudeness, Duder, El Dudarino..." - The Big Lebowski
"My life is a dark room. One big dark room." - BeetleJuice
Because Jumanji is an African board game which takes you to the jungle. Jumanji is an African sounding word, maybe Swahili word.
Zathura or whatever crap it's called, sounds more like a word from outer space, like Darth Vader. It is a jumanji sequel which will most likely suck as much as the original...