One factor may be that they expect 1.5 billion in revenue from 3 devices (Playstation 4.5, Nintendo NX, Microsoft Xbox One.5???) [1]
But the chinese deal is probably the main reason
They slightly beat expectations, but that can't be the whole story. Might be something to do with Intel's recent weakness and restructuring (moving away from the PC market), perhaps the PS4.5 rumors...
It could also be something fishy. Stock prices are sometimes inflated like this to make a safe exit just before something disastrous happens.
Inflated on purpose? That'd not be legal
Laws are like locks: they only keep honest people honest.