The unnamed Nook bears the model number BNVR520, and it appears to be a 6" device. I can also report that it was tested for Wifi and hs a 1.5Ah battery, but just about all other details have been concealed by B&N under the usual confidentiality request.
There's speculation elsewhere on the web that the new Nook will launch this week, and that is very likely true given that the confidentiality period ends on 16 November.
So if we don't know more by Friday, we will know more in a couple weeks.
(Thanks, Phil, for the tip!)