Art Lebedev announced in his Blog that the keypad (Optimus Pultius) will be released under the name Optimus Optimus Aux.
Optimus Aux a 15-keys addition to any keyboard. To be used with the Maximus or with any other non-display keyboard.

Optimus Pultius uses the same principles as Maximus, has the same display keys and the same set of ports on the back (using one instead of two additional USB hub slots).