Meanwhile, AFAIK everyone has agreed on a standard AC charging connector good for 120/240 V, with the connector itself being good up to about 90A (it looks like Tesla is using it with a 50A rectifier, and Nissan 30A).
Nissan's 80% quick charge in 30 minutes connector probably isn't quite high enough wattage to 80% charge a 53 kWH battery pack (as is found in the Tesla Roadster) in 30 minutes, and I think that 80% in 30 minutes may be the magic cutoff for claiming the $5000 California tax credit for buying one of these things, which leads to the question of whether Tesla will have an incentive to get quick chargers introduced which will be incompatible with the initial version of the Leaf.
(As a practical matter, I think if these chargers max out at 500 VDC at 125A, that's probably good enough for road trips, though higher wattage might be nice.)