EA Sports made the summer transfers available in FIFA 15 Ultimate Team mode.
The latest player transfers are now available in FUT 15 packs. Over the course of the next few months, as player transfers are approved in the real-world EA will make those same changes in FIFA Ultimate Team.
Below is the list of FUT 15 summer transfers which will be updated as transfer window is updated.
Source: EA Sports
Take note that above list only applies to new items found in packs. If you obtained a player item prior to their transfer, their item will not change while in your collection. You may also look for them in the Transfer Market.