EA has made the latest skill upgrades available in FIFA 16 Ultimate Team. The player card with upgraded skills are now available in FUT 16 packs. Here is the complete list of skill upgrades in FUT 16:
Source: EA Sports
You can find the upgraded players in our FIFA 16 Players Database as well.
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.