Personally, I think it might be fun to check out the supplements but I'm not really that excited to check them out or anything. Again, this is just me being biased from 3rd edition but in 3rd edition the new stuff was either too ridiculous or the normal PHB stuff was better. Just for easiness sake also I don't really plan on trying to use them. This is an early decision since I haven't looked at the new books, but last time they just seemed like more hassle then it is worth. Especially because in 3rd edition they introduced books that had completely separate rules than the core 3e game, which I really didn't like at all.