I've been reading the rumours about the Sony Hayabusa in June/July. I'm think I'm still going to get the Xperia S.
The problem with phones is that there's always a new one on the horizon. If I waited for that I'm sure between now and then another phone will be announced as coming soon so by the time the Hayabusa is released I'd be waiting for the next big thing. You end up constantly changing your mind, waiting, changing your mind, waiting, etc. You'll never actually get a new phone!