Yeah, they aren't making gmod 2. S&Box is supposed to be a lot better looking and run a lot better though. On top of that we'll be able to use C# and hot-loading is enabled, so I think it will be pretty good and a decent upgrade. On the down-side, the release will most likely kill gmod completely. I suppose it has been 15 years though, however who knows what the better choice is, I think if the new game is truly a lot better, then it should be an easy decision to go for it. If it is going to be a bad game, then most likely it won't even be worth going for. However, I can't tell and we'll have to wait for the actual developers to make their decision, but as of now it looks like its happening, just nobody is sure of when.