A release date of September 24 has been listed by Amazon for FIFA 14 in North America. The product listing is for an unannounced Vita version of FIFA.
If we look back on the release of earlier installments of the game, we see that FIFA 12 and subsequently FIFA 13 were released in the US in the last week of September with European releases following a few days after.
EA has already announced FIFA 14 for PC, PS3 and Xbox 360 last week, adding that the coming months will see the release of other formats of the game.
EA is currently looking for FIFA 14 testers for playtest sessions.