Who is excited?
The entire set is spoiled, everyone is working hard on their prerelease guides and QS is busy gathering data to help put together the prerelease cheat sheet to help you make the most effective trades you can.
The Limited experts will be weighing in soon with the opinion about how to build but if you aren't content to wait, there are tools that will let you explore a bit on your own. One I found that I liked was a Dragons of Tarkir sealed pool generator that even lets you pick which seeded pack you want so you can get the full prerelease experience. It is available at this link.
I have jammed a few pools and while it suffers from the same problem most of these tools do in that the same rares crop up somewhat often, it was instructive and fun to monkey with. Those who prefer to play Sealed in person and are at GP Cleveland this weekend can find me on the floor durdling. Come say hi.