First PRO zoom lenses are in Stock at Amazon US via third party resellers. But like you see there is a heavy $400 extra to pay. Just wait a couple of days more until Amazon itself will have them in Stock! In the meantime check out these Olympus M.Zuiko PRO 40-150mm f/2.8 Sample Photos at ePhotozine.
40-150mm PRO shipping info at:
In USA/Canada at Amazon, Adorama, Bhphoto, GetOlympus and GetOlympus Canada.
In Europe at Wex UK, Technikdirekt and Amazon.
In Asia at Digitalrev and Amazon Japan.