Agreed, I doubt OEM's are pissed. Now they have an excuse to upsell the customer. I imagine the decision to move on or stay with a socket or firmware lock is 50% technical and 50% commercial for Intel. They need to keep OEMs happy and sales flowing. They don't want to just sell CPUs and have end users pop-in new CPUs and lose the support and goodwill of OEMs with mb's and systems to sell.
From a marketing perspective this means a new model number, new ads, etc all designed to make last years system obsolete and to bug you into buying the latest and greatest.
I bet theyre pissed. If it was compatible, people would buy more boards they already designed, now they have to create and manufacture new boards that compete with old stock. Likely, due to AMD some OEMs are having trouble selling intel chipsets in that socket size
From a marketing perspective this means a new model number, new ads, etc all designed to make last years system obsolete and to bug you into buying the latest and greatest.