Today Xat announced that the next power will be the SILLY power. With little to go on right now, it *looks* to be a Smiley power.
Here are some (all?) of the SILLY smileys:
Those who already have the power can go test it out on the Xatworld.com xat_test chat.
Credit goes to Hean for getting us the screenshots and the list of Smileys. Thanks Hean! 🙂