It is understandable why EOS bodies are not easy to find lately, but ... the Canon EOS-1Ds Mark III remains unavailable while all other EOS models come into stock occassionally.
I'm not looking to start a rumor, but ... if the 1Ds III was being imminently replaced, Canon might decide to put its limited resources into production of the replacement model.
I mentioned in my When is the Canon EOS 5D Mark III Going to be Announced? post that the Canon EOS-1Ds Mark IV is overdue based on the replacement schedule the prior 1Ds models followed.
The current lack of 1Ds III bodies along with the model age gives me cause to guess that a 1Ds IV could be announced in August (or perhaps September).