A lot is really in the titles being gone and the program shifting. You still have store play, but it can be on any day at any time. A lot of stores are still doing the same day/time, but others are shifting. Stores receive a copy of the intro adventure (also released this time on Dragon+) plus a special cert they can give out. The name Encounters no longer is used.
For Expeditions, you basically just remove the name and have the same adventures and program, plus the ability to now get them on the Guild and play them anywhere (not just at cons and stores).
I need to rewrite the whole front page, but I'm busy with authoring and then vacation. I'll try to update in the next two weeks! Sorry for the delay!