There are over 13,000 reservations as of a week ago, and the pace of reservations is accelerating dramatically.
Chevy Volt is doing halfway decent selling 1,800 units per month even if it isn't as good as original projections.
Reservations in August for Model S are already coming close to that pace and the upward trend is accelerating, with each retail store now ramping up to multiple reservations per day.
Tesla is already planning to increase production to a monthly rate that translates into 30,000 units per year, but based on current trends it looks increasingly likely that next year's production might be sold out as early as January or February.
As to who will want the car, it's anyone who wants a new BMW/Audi/Mercedes and who wants to look earth conscious, tech savy, or hip while also saving a ton of money compared to the competition.
Model S Performance (the regular production model as opposed to the limited edition Signature Founders edition used in the test) costs less than BMW M5 even before the huge yearly savings on gas and maintenance (the performance is identical to the tested car, but it has different paint and interior options and is not a limited edition).
Model S 85 costs the same as the 550i GT (its most similar competitor) and saves thousands per year. It also competes with and compares favorably to various 7 series offerings while costing the same or less, and always saving a ton of operating expenses.
Those two cars are the bread and butter of the Model S lineup and are hyper competitive with their conventional counterparts. There are a million plus cars sold in this segment globally and Model S has a big competitive advantage.