Several hours ago, United States FCC (Federal Communications Commission) published documents about an incoming Raspberry Pi 3 submitted by the Raspberry Pi Trading under FCC ID 2ABCB-RPI32 on Feb 26 2016.
The FCC link can be found here
Apparently the new Raspberry Pi 3 has a built-in 2.4GHz wifi module and bluetooth as shown in the FCC documents. Finally!
Here are some photos from the FCC document. The new RPi looks very similar to RPi 2, same number of GPIO pins, same number of USB slots (however with the built-in wifi module you gain one more!), etc. However we don't know the detailed specs. FCC only care about wireless communication frequency and power, that's why these documents are there. We will need to wait until an official release by RPi foundation.
Also please check this pcworld post pcworld