Apple has wasted very little time to bring this update for your iPad. The only known addition is a patch for the JailbreakMe exploit used to jailbreak all iDevices. So if you want to stay jailbroken, or would like to jailbreak your iPad, I would suggest staying on 3.2.1. I would also recommend that you save your SHSH blobs in case you accidentally update your iPad. SHSH blobs allow you to downgrade your iPad and are unique per iPad. This means you can’t Google and download SHSH blobs. You have to retrieve them yourself.