If you're in the USA - just buy a 645D, problem solved
Last I heard, if you bought a 645d in the USA you automatically got access to the Pro Network.
Not the case here in Australia though, I asked about it and was told the current network is good enough as is, so no need to offer the pro service due to already fast turn around times and lots of servicing centres and trained technicians (though my 645D still went back to Japan for warranty work) .... the free cleans, access to a hire pool, try before you buy ....etc was convieniently glossed over and forgotten about though