The Mr. Magorium's Wonder Emporium point you made oskar, is a very good one. Although, Walt Jr. seemed pretty upset about the whole thing and I get the impression he doesn't want to be affiliated with it in any way after the b-b-b-bastards scene.

Walt is going to war and is going after the Nazi's. I don't see him infiltrating their base Splinter Cell style as a skinny old man with the big C. Instead, he's going to blow them to smithereens the same way Fring went.

Walt and Skyler are going to jail for a very long time and will be remembered as the most notorious drug couple in the area. Walt Jr. and his sister go to live with Aunt Purple.

As far as Jesse goes - I think he suicide bombs himself with the lab or something Walt puts together to take out the Nazi's.