The deployment wizard was not showing any Task Sequences after an upgrade from MDT 2010 U1 to MDT 2012 beta2.
Of course I updated my Deployment Share after the upgrade. Updating a second time, and completely regenerate the boot images got my attention that I didn’t reimported the boot images into WDS.
After reimporting the new generated boot images with MDT 2012 my Task Sequences showed up and I was able to start deploying again!
So don’t forget to reimport your WinPE boot images after upgrading to MDT 2012!