I'd be more than happy to just be able to kill some ugly deer mobs or something.
You know, on the HUGE map size.
The only way to get any hint as to what he's doing is to stop by the Minecraft IRC when he's on and ask questions.
Well, you can try anyway. Most of the time you'll spend sitting there watching the poor guy get bombarded by everybody ever, asking questions, popping suggestions, giving coding advice, and stuff.
It's pretty nutty in there when Notch shows up and it only gets worse. But he insists that's his preferred place to hear people, so..
Yeah, I'm usually in there but I'm afraid I have no clue what he'll be doing next. If we're lucky, he'll let us know on the dev blog what he's up to.
Regardless, we wait.
EDIT: Yeah, since the last client update, I've been getting browser lock-ups as well.
I'll report the issue. Make sure you do as well.