I can't wait to get playing...I've got a whole bunch of concepts I want to try. First one is an Eladrin Rogue - I also like the slider/positioning stuff and was going to pick it up to synergize with the Feystep power. That and they get a neat dex bonus and have the fey flavor, which is nice.
Next thing, Halfling Warlord. Because its just hilarious to have a leader that's 4' 2". Besides, Halflings do a Cha bonus...
Half-Elf, some martial class, maybe fighter. Have it get an Arcane power for its racial feature, then use it to gain access to arcane wands. Get a ton of low-level wands to ice martial fun with arcane tricks. Granted, they're all 1/day abilities, but it would still be fun to make a pseudo Gishy thing without actually multiclassing. The best part is, I actually can multiclass later into a Divine class, and therefore have access to all 3 power types. When they release divine wands, it'll be able to use those too. Fun stuff here.
Dragonborn Warlock, Infernal or Star pact, with a splash of fey powers here and there. Have the breath weapon be Con based and make sure to max that attribute. The Cha bonus can keep that attribute from being too low, so you can still grab some of the better fey powers without sucking.
I also have a friend who might re-create a Human Warlock from 3.5, probably by going with Fey or Star pact. Its a shame though, most of my friends don't like 4E that much, and we already don't meet much as is. I probably won't get to try all these for quite some time