From what I have read in various places, Blu is definitely open for breakfast for AQ folks. I can't remember if it is also open for lunch, but I am sure the folks who answered this thread originally can answer that.
Speaking of AQ on Solstice, when we originally booked for our 9/5 sailing, AQ was only a hundred dollars a person more than CC. Since then, the AQ price for that sailing has dropped. We just realized a $398 savings total for the 2 of us. As many have said on this board, keeping an eye on the prices periodically pays off. The only thing different we would do differently would be to grab a hump cabin were it to be available, as the balconies are larger. Next time....and there will be a next time.