Another thing I can attest to, possibly related—when scrolling through headers with ⌘[ or ⌘], the newly highlighted headers sometimes appear off-screen, above the upper border. This doesn't happen by default, but seems to be triggered in full-screen only, by scrolling through particularly long patches of text within one header (more than one screen worth of lines)?
Also I found the new arrow-key scrolling behaviour (centering cursor in the middle) kinda jumpy and hard to follow, if I may express that opinion. ^_^