It's weird. I'm totally looking forward to 4e [I know there'll be things I dislike as I'm sure there will be in every single edition of anything I'm interested in, but my interest has been piqued nonetheless], yet I hate it cause I'm 'there's so much I feel like I could be doing about my current 3x stuff, but most of it will be useless in like 8 months.'
As a fan of working on monsters and having only actually used a few of the ones I've created, I have a feeling one of the first things I'll be working on is converting all the monsters I've created, which may not be so simple but will probably be a necessity to me.