I read the update on the Chummer website that he's not going to do more updates for Chummer (which is exclusively 4th edition), and will instead design and plan a completely new program for SR5.
Which I think is cool.
I haven't heard a peep about Stormfront, except that it's supposed to contain the plotlines that make a major point in SR5 (sorry about using that term a lot, trying to get used to it). I do like that all of the new(er) content has suggestions and plotlines rather than hard adventures, so you can run them no matter what edition you're playing.
- Logain