Admits responsibility and says their current course of action (working with key stakeholders). Addresses concerns of the workaround. Has a timeframe for future updates. Has a call to action for what you should be doing next. To those of you pointing out that this is PR, you're right but that's not a problem...
Short and sweet and has it all. If anything, it is a day late but monstrous organizations probably had a lot of bureaucracy to cut through.
People are so reactionary and quick to throw any company with a security issue under the bus, without ever having been on the other side of the table. The reality is issues happen to everyone and Intel wants to fix it.