Confirmed on Thursday (8/1), Avatar will have 3 sequels, bringing it up to 4.
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(and yes, I bolded 'official' since I used confirmed in above statement)
Just over 13 months after Sigourney Weaver revealed that James Cameron was planning to make three "Avatar" follow-up films instead of two, the news became official on Thursday. Cameron will co-write the three sequels simultaneously with four different screenwriters.
As reported by Variety, Cameron will collaborate with Josh Friedman ("War of the Worlds"), Rick Jaffa & Amanda Silver ("Rise of the Planets of the Apes"), and Shane Salerno ("Savages") on the screenplays for "Avatar 2," "Avatar 3" and "Avatar 4." Twentieth Century Fox will release all three films over the course of three years, from 2016 through 2018. It's expected that the "Avatar" sequels will arrive in theaters in December of those respective years.
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(and yes, I bolded 'official' since I used confirmed in above statement)