Will Tesla wait until the EV tax credit issue is resolved by congress before opening the the configurator to the general public (or at least taking orders). There could be lots of people placing binding orders not knowing how much the car will cost them. Obviously it's up to the buyer if they want to take that gamble but would Tesla rather just want to avoid a possible slew of buyers clamoring for a refund. Of course Tesla could always make an exception if that happens and grant the refunds, it's not like the cars will be custom built and there are plenty of other customers.