This is a scaled model for Eole, a french project under CNES on developing an unmanned aerial platform for launching rockets. This scaled model (1/2.2) is evaluating the flight dynamics and by next year rocket launches will take place in a specialized facility by the full version. It will be fully autonomous apart from the take-off and landing and it will operate within a 30km range. It looks like Scaled Composites White Knight 1 but it is much smaller.
More info :
project website (in French): Présentation EOLE