Microsoft likely anticipated weaker demand for Win8 which is why they are focusing their promotions on the consumer market at this point. Once they work out the issues they will repackage a new version for enterprises running Win7.
Microsoft knows that the consumer desktop market is dwindling and that competing with Apple and Samsung in the consumer mobile space isn't viable at this point. However, the enterprise desktop market isn't going anywhere at this point and leveraging their enterprise desktop dominance as a way into mobile enterprise devices is their best option. IT managers will prefer an end-to-end Win9 solution for all desktops and mobile devices over managing disparate architectures.
Microsoft knows that the consumer desktop market is dwindling and that competing with Apple and Samsung in the consumer mobile space isn't viable at this point. However, the enterprise desktop market isn't going anywhere at this point and leveraging their enterprise desktop dominance as a way into mobile enterprise devices is their best option. IT managers will prefer an end-to-end Win9 solution for all desktops and mobile devices over managing disparate architectures.