According to Flight Global, The Government wants to develop a rocket, dubbed "LauncherOne," to sit on the back of WhiteKnightTwo and when the craft reaches the proper altitude, lauch off on its own to begin orbit. The microsatellites would be under 200kg in weight, though it's unclear exactly what the satellites will do. But with all these add-ons, WhiteKnightTwo is starting to remind me of The Centurions or something. [Flight Global via The Register]
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There's a company in the UK called Surrey Satellite Technology that specializes in micro satellites. I suspect it's their satellites that they'd want to launch using this.