Mad Catz has a mobile S.T.R.I.K.E.M keyboard.
Mad Catz is pitching the S.T.R.I.K.E.M as ideal for tablets, smartphones and laptops but also says that the product would be as well suited to its own M.O.J.O. Micro-Console for Android. The S.T.R.I.K.E.M comes with support for both Bluetooth and NFC in terms of connectivity. The S.T.R.I.K.E.M's exact size is not mentioned, but Mad Catz does say it features a tablet-sized footprint, so that should give you some idea of how big it is.
The S.T.R.I.K.E.M features backlit P.U.L.S.E. scissor keys and an Optical Finger Navigation Mouse Sensor with dedicated mouse buttons, as well as dedicated media buttons, a volume scroll wheel, and onboard memory for storing macro commands. It's powered by a rechargeable Lithium Polymer battery (which means no fiddling around with batteries).
No word on pricing for availability other than the fact that it will be out in time for the holidays. You'll have your pick of red, black and white once it is available, though.