Almost beyond a doubt, the Explorer will be FWD with optional AWD, based on the Flex's architecture. Strangely, this will make it lighter than the Edge, given how much they needed to beef up CD3 for the application.
As an interesting nugget of information from Ford, the F100 will feature the Expedition's IRS either as standard or optional equipment, as well as the 3.5L RWD Ecoboost engine... 425 horses of glory.
Seems I was right about the Lightning coming back.. just not in F-150 form.