If you're curious on the availability of a Seidio case for your new Droid 3 here is the response I received from customer service. If enough people send them email maybe it will spur them to get new cases out.
"Thank you for contacting Seidioonline.com. We have not finalized plans on making cases and accessories for the Droid 3, however your request will be forwarded to product development. If you have any other questions or concerns, please feel free to contact us at 832-204-1118."