HP has a “Microsoft product release chart” on its Large Enterprise Business page and it states that OCS 14 / 2010 will be released in Q4 of 2010 so in about a year from now,  i would have hoped for Q2 since i predict that its going to have some kick ass features.

Source http://h30458.www3.hp.com/us/us/ent/808787.html

However Computerworld wrote: SharePoint 2010 and OCS 2010 are expected to ship in May or June of next year, although Microsoft has not released an official ship date. about one week ago

You can read more in their article about Exchange 2010 here