This is an old revision of the document!
I doubt that anyone know this date. Right now they state preliminary date as 30 of July 2012. It could shift further forward, but I hope it won't happen.
But never plan that you could start shooting in August. Be safe and assume that you'll have it is September or October.
Most certainly yes. I think shortages will maintain for three, may be four months. You must also take into account that if some early bugs (with sensor, battery, overheating) will be found during initial batches it could shift the date then it'll be available in your store for another few months.