I guess I'm in the minority of being a huge fan of the original Roswell who loves the new series too--though I'll freely admit that the original was better. I guess, being a comic fan, I've just gotten used to multiple interpretations of the same source material.
I'm ecstatic about the news that Jason's going to be on the new show, though. Personally, I've always held out hope that he'd end up playing Ray Iburg or a similar character if he ever made a guest-appearance. In the books, Ray was basically the book version of Nasedo, only a genuine good guy rather than a killer. Since one of the major differences between King-Max and Deputy-Max are their level of control over their powers, I feel it would be kind of meta for Jason's character to be a sort of mentor figure and help him learn that control.
IMO - The episode Shiri directed in the first season was the best episode of the season, so I can only imagine how great it's going to be when they're BOTH involved. Can't wait!
