Windows Phone GDR 2 update will likely start hitting handsets in July
Telstra is pretty good at letting us know when their phones are getting updates. In their latest post they note, despite still awaiting firmware, that they expect to certify Windows Phone GDR2 on either the 8th or 15th July, which means this OS update, which brings new features like CalDav and FM Radio support, will likely start hitting handsets by the end of that month.
Of course this timeline is specific to Telstra, but it is likely to be the same around the world, except of course for AT&T, which always tends to move a lot slower.
See the page at Telstra here.