Some noteworthy addendums:
First, yes, Mike Mearls said they were going to be releasing old back catalog in electronic format. I don't recall his exact words, but the implication was that they were planning to release everything. No word on what exact formats would be used, how they'd be priced, etc. I suspect response to the release of the AD&D core books with new covers may have helped this along, though it's clearly an enticement for OSR types, as well as those who've gone to Paizo (since I'm sure they'll be releasing some 3.5 stuff as well).
Second, a huge chunk of the presentation was Ed Greenwood, in the dramatic sort of voice I imagine in my head when I read the back-cover blurbs on paperback novels, talking about the Forgotten Realms and six planned novels that will prepare the Realms for 5e. Novels are still a bright spot on D&D's balance sheet, clearly, and as we left the keynote we were gifted with a poster that included character sketches for the covers of the novels.
More on what happened Friday as I recover enough to write it up. Good panels and a great night of gaming with Tavis Allison, tinkering with ACKS mass-combat rules.
Oh, and an encounter with Larry Elmore...