There's a thread on DPR where a rumour of a semi-pro Oly camera between the E520 and E3 is being discussed. Rumours are rumours but someone found a trade mark application for E-30 I can't make the links work (it says "unrecoverable data") but the application is real - I've seen it with my own eyes. So, you'll either have to take my word for it or find the thread on DPR.