I will pack my race suit just in case none of the drivers show up and they need a stand in test driver! Having sat in the Ferrari F1 car from 2012 at the factory a few years back and realising that my arse was too big to get into the seat, means that opportunity is pretty unlikely. No harm in dreaming though.
You will have seen perhaps that Redbull announced their new car last night and that Ferrari are due to show theirs to the public tomorrow and then McLaren next week. The official date for the Mercedes is the 22nd though, I expect my camera phone to be confiscated.