If you want to see the list of SIGGRAPH 2013 papers, see Kesen’s site (well, just a start – more coming as they leak out).
If you want to reserve a hotel spot, go here now. It’s free, no deposit or loss if you cancel in time, so I recommend doing so if there’s the slightest chance you’ll go.
(Oh, and if you’re more a GDC fan, happening this week, try watching Twitter, though people haven’t been tagging religiously.)