ZEC have confirmed 27th June as the date for the Presidential run-off - well past the date required by law, but I understand that Presidential powers have been used to amend the relevant laws accordingly (although how Presidential laws can be used when there technically is no President at the moment is another thing).  Tsvangirai will take part, but has also revealed to the BBC that there are “noises off” from Zanu-PF about the possibility of a unity government, and that MDC will listen to any formal approach.

I can’t help but think that any attempt to form a unity government is just an attempt by Zanu-PF to retain some sort of power, or to appear to be reasonable while having no such intentions (especially of retaining Mugabe as President is one of their terms - they know MDC would never accept that, but by offering and having MDC refuse they can at least try to claim their efforts to calm the situation were rebuffed).  It does mean there could be a few twists and turns in the story yet, though,