That was a concern for me as well, seeing as how release-happy Moto has been in the past (specifically Droid 3 --> Droid 4).
But how I see it, the Razr --> Razr HD transition, we saw a different design and better screen, mainly. I wasn't happy with their 720p decision on the 2013 Droids, but after looking at it in the store, it didn't bother me. So if they choose to release a 1080p update, I probably won't care too much unless the design of the device is amazing. I doubt Motorola would create a battery that's like 3800-4000mAH, and the battery life is just fine right now. Same for the camera - I doubt Motorola will actually release an amazing camera...
Not sure what else they would add that would make me want it. MicroSD maybe?