There are new details regarding power and battery, and this Xtreme thing will have a 10.000mAh battery built in, which is obviously necessary to power the 40Watts amp.
The battery indicator is similar to the one on the Infinity One, but it was moved to the front now (clever!) As visible from the other product images the JBL Xtreme has an own kind of zipper to protect the ports. They finally seem to take water protection more serious with the Xtreme than with the Charge 2+, which has the ports completely unprotected.
Could be a real beast of a speaker, making the UE Megaboom sound funny...