The cover was photographed and designed by Meghan Derico of Derico Photography. She also prepared the cover for Lyon's Legacy, and she did a great job of branding the books to show they're in the same series.
Once I've reviewed and approved the proof for the paperback, I'll format the e-books. There's a very good chance the books will be ready for publication before the "official" release date of 3/17/13. In the meantime, you can find Twinned Universes on Goodreads.