If you'd prefer a more appropriate response:
1. "No more Beatles DLC!" - If Apple decides later on they want to release more Beatles DLC, but then see this announcement, chances are they'll cancel their DLC plans. Nobody wants to work with a company that doesn't consult their business partners before making such statements.
2. "We're going to bring you guys more DLC in the future!" - If Apple decides later on to scrap that idea, or there's a problem with the masters, or something just goes wrong in general, you guys are pissed at Harmonix.
3. "We'll see what we can do!" - They'll see what they can do. That's it.
Trust me, there are plenty of Beatles tracks I'd like to see, if Harmonix could somehow make the keyboard compatible. Just because I'm saying all this doesn't mean I hate the Beatles more than Hitler and hope they never release another track ever again. Still, some of us need to grow up and face reality. It's just a game.