I am going (on Sunday as well) and Jorael probably is too (i bought his ticket, so he'd better show up)
For now, I'm thinking Rakdos is the way to go, because Hellbent will pretty much take care of itself and it has some kick-ass removal and discard.
Azorius has a lot of small flying creatures, which could be good..
BGR I think is the way to go: Holding nothing back, playing fatties and removal and have some way to ensure 'good' draws through dredge..
But I've never won a Prerelease, so feel free to ignore me