I think Tesla got it exactly right, for the US anyway, with the line of charging accessories for the Roadster: the "intelligent" High Power Wall Connector supporting 240 V 70 amps, the 240 V NEMA 10-50 Universal Mobile Connector supporting amperages up to 70, the additional plug adapters for it, and the long-cord 120 V Spare Connector.
However, it seems likely that the Model S will have a J1772 port instead of the Roadster port. Which means that as a Model S purchaser, I can't actually buy the versions currently on sale from Tesla.
I'm *hoping* Tesla will offer exactly the same line of Clipper Creek products only with J1772 plugs. If they do, I'll buy the lot of them, HPWC, UMC, and all the extra plug adapters. But so far nothing has been confirmed.
I'd particularly like to buy the High Power Wall Connector *before* I get my car, so that I can have it installed and ready to use when my car arrives. Electrical work may take a while to schedule; I don't want to be charging off a 110V 20 amp socket (which is the best thing I have in my garage). And although I could install a NEMA 10-50 right now, I don't want to do the electrical work twice, installing a NEMA 10-50 and then turning around and installing the HPWC a few months later.
Hence the question in the subject title.
(As a side note, my house is new, from 2003, and my main house breaker is rated for 200 amps. And my house currently uses so little electricity, I worked out the average load is under 10 amps, so even if the peak is higher, I'm not going to blow the breakers. So I figure when the HPWC for Model S is available, assuming that it will be, I can just buy the '90 amp breaker' model and tell my electrician to install it. Am I right?)