Thankfully, if you've got one of Mitsubishi's 2010 models, you don't have to worry.  A new update is available from Mitsubishi today that updates the sets to be compatible with all of the current 3D formats.  There's no need for an adapter anymore.

If you're not in a hurry, you don't need to do anything to get the upgrade.  It will be automatically applied to your TV between now and December first.  If you want to give the new update a try now, you can download it immediately from Mitsubishi.