I got some small info about the next three Olympus PRO lenses:
1) 7-14mm PRO lens will ship between late June and early July. It will cost 1399 Euro
2) Olympus got little “interest” from dealers about the 8mm PRO fisheye lens.
3) 300mm f/4.0. Apparently Olympus told to dealers the lens release got delayed. No specific timeframe of the release were given.
Reminder: Two of the future PRO lenses are listed here:
Olympus M.ZUIKO DIGITAL ED 7-14mm f/2.8 PRO Lens (here at BHphoto).
Olympus M.ZUIKO DIGITAL ED 300mm f/4 PRO Lens (here at BHphoto).