No, your wife wont be able too, you will have to give all the documents and prepare a visa for her when you are here., unless you are given it already (but I doubt that).
It is a royal pain in the arse, or used to be to get your wife here on a visa and she will have to go throught the same RP process as you..... good luck!
in saying that, I doubt that it is better than it was a couple years ago and will take time.
I highly recommend to leave here at home for the first month at least if you can; as you will have to get used to the place and get all your running around done as well.
re: the Aug start date.
That will be a minimum time to expect.... this is the dates given by the same people that hired all those waiting around now.... so maybe they learnt their lesson..... but somehow I think not!
They will need to get through many many people sitting around here and I dont see that happening in 6 months.
Good luck though.