Optimus mini six has the same key size but only 6 buttons. Shipping in November 2012.
Optimus Aux uses the same keys as Optimus Maximus (but only 15 of them). Shipping in November 2012.
Visit us @ 2012 International CES (January 10 through 13, 2012 in Las Vegas). We'll be at the Venetian Ballroom, level 2, booth #70621.