I wont go much into details and further tech specs, as you will find all information on their dedicated sites, but both speakers will cost exactly 349$/ thus making them directly comparable and putting them a step above current offerings from Bose, Infinity or whatever.
The big difference I see between both is that Bang & Olufsen really tried to make a portable speaker with an own grip, 360° sound, a 24 hours battery life and USB-charging of external devices while B&W was rather trying to copy existing concepts and make their own version out of it.
I would really love to hear both side by side and prepare a detailed comparison.
Update: The B&W T7 should arrive tomorrow,
Update2: My B&W T7 review is already finished. I can already reveal that one of them is considerably more serious sounding... you guess which.
Update3: Finally also my B&O Beoplay A2 review is finished.