My bet is pop ups like the M-B SL
That's my guess. The California has pop up roll bars. My thinking is that IF they do a hard top instead of soft, it's easier to get the top to move around without the roll bars in the way.
Rollbars with screens help reduce backdraft. On the 360 and 430 they are integrated into the design and look great. probably won't look so great on 458 though.
Well I believe Ferrari have completely redesigned the rear end and not just chopped the roof and incorporated a folding hard top. But time will tell.