Since mobo's have been ready for months, its more likely old inventory and product marketing thats the hold-up.New product launches require lots of coordination with retail partners and with product marketing. For instance, they need to give their motherboard partners enough time to prepare their products.
And/or high volume production for 32nm in the X-th fab, This will shift all the flagship hex quad and dual core production to 32nm. It needs to be perfect, in volume, and with good yields before launch. Clarkdale/Arrandale is small, gulftown is high-ASP. The mainstream segments have to be profitable.