I hope for a Layout with cool Art.
They've noted that they realize that the pdf is different from the print book, and that art isn't so useful in the pdf version. So I would not expect to see much. Basic's layout will probably remain utilitarian.
Agree, and don't mind this one bit. Many retro clone systems that are free to download reserve the artwork for the printed versions. I like being able to to print a basic pdf without having to worry about excluding art, or worse, having to use up valuable ink printing it because there is text on the same page. Compact and functional is perfect for basic.
No announcement AFAIK. Might expect something later today, or Monday perhaps.
There was talk of guidelines for converting old modules to 5e being posted, and some other stuff that was left out of the DMG for space reasons, but that might not come right now. We'll know when we know ...