My primary concern going forward is that iPhone 5 will likely see 1080p video and an 8mp camera, further eating up disk space. I'd prefer 128GB, but I don't think that is possible.
Doubt very much you will see 1080p. Apple has made its bed in 720 for the time being. It's not like the current 5mp camera can't do 1080, which is less than 1mp.