Shortages
Prices
New product available soon
All these will factor into lower output in the month before a new major release
What will be interesting is if intel have been sandbagging and the shortages are actually due to them have vast amounts of new stock ready to roll.
If this is the case, and the chips turn out to be more than 10% better than the models they replace, then I should think it’ll look rosy again for them.
They won't have had time in the design cycle to deal with Spectre/Meltdown, so they will have to live with the loss of performance due to the mitigations. That's going to hurt them in datacentre and the like.