UPDATE 2: The FIFA 15 demo is out now for PS4 and PS3.
Grab it from the PlayStation Store.
While we're at it, the FIFA 15 demo came out for PC overnight. You need an Origin account to play.
UPDATE 1: The FIFA 15 demo won't launch on PlayStation 4 and PlayStation 3 until tomorrow, 10th September, Sony has said.
To confirm the #FIFA15Demo is coming to PlayStation tomorrow! We'll make sure you know as soon as it's live on store.— PlayStation Europe (@PlayStationEU) September 9, 2014
ORIGINAL STORY: The FIFA 15 demo is out now on Xbox One.
It's already available for Xbox One via the Xbox Store. There it weighs in at 3.07GB.
The available teams are: Chelsea, Liverpool, Man City, Dortmund, Napoli, PSG, Barcelona and Boca Juniors.
Also included is an Ultimate Team demo experience, which teaches you how to sort your cards into a team. Then you can play a match with your Ultimate Teams to test out the chemistry ratings.
According to a tweet from EA Sports, the demo will "eventually" be released on Xbox 360, PlayStation 3, PlayStation 4 and PC.
According to a post on the PlayStation Blog, the demo will launch on PlayStation platforms today, 9th September. We'll keep an eye out.
FIFA 15 launches on 26th September.