How can I upgrade my jailbroken iPad?
The straightforward way is to wait until the current version of iOS is jailbroken, and then upgrade and rejailbreak - there are applications you can use (a handy range is described at http://www.cultofmac.com/169467/how-to-backup-your-jailbreak-apps-and-tweaks-from-cydia-ultimate-roundup/) to back up the 'jailbroken bits' of the device, but I personally prefer just upgrading and then putting back on those cydia apps that I really want on my own - they way I also have had the chance for a bit of a clear out.