FIFA 14 was just announced last week with no release date and the only platforms listed as PlayStation 3, Xbox 360, and PC. However, Amazon.com is already listing the game for a September 24 release, and added Vita as a platform as well.
The Vita entry lists the game for $39.99, while the Xbox 360 and PS3 versions are listed at $59.99. The Vita listing isn't too surprising, given that FIFA Soccer 13 came out on Vita, as well as the Wii, Wii U, 3DS, PS2 and PSP. The FIFA series is one of EA's top franchises worldwide, so it makes sense to offer the game on as many platforms as possible.
We've contacted EA Sports for confirmation, and will update if we get a response.