I don't see how they can possibly fix all the elements by "Blue" if it's to come late this year, or even if they plan to. Hope I'm proven wrong. The move to yearly (or near-yearly) updates is promising, but that depends on the severity of changes, pricing, update mechanisms, etc.
Well, you're assuming that they weren't already working on fixing these things post-RTM. Blue seems to be more of a UI update as the rumors suggest things like 3 start screen tile sizes (ala WP), opaque taskbar, and a "flatter explorer." Don't see why this update can't include icon fixes, though I wouldn't bet on all icons being updated at once.