I know at least one gamer who is impatiently waiting for the Forgotten Realms Player's Guide to come out. It's not because he is a huge Forgotten Realms fan. It's so that he can check out the new Swordmage class. He has always been a big fan of the Gish concept, and sees 4th Edition D&D as the first edition of D&D that can handle the concept easily.
Wizards of the Coast recently excerpted the Swordmage at their website. Its a nice excerpt, but not really playable. If you are looking to play one right away though, you still might be in luck. Simply check out RPGA's Living Forgotten Realms Campaign Character Creation Guide.
The preview material contains 4th Edition write-ups for playing a Drow, Genasi, and yes even the Swordmage. Well, at least up to level three. Still, that would be enough to get you through H1: Keep on the Shadowfell.
Or I suppose you could just wait sixteen days. But who has that kind of patience nowadays?