I have not heard anything about leasing a 921, infact when Charlie was asked about it recently he said no because the box cost more then $1000 to make and renting a box to a customer for $10 a month does not make economic sense.
I have heard there will be an 811 DHP option in the future.
Charlie said that he probably couldn't unless you paid like $50 a month, just as aperry says. Perhaps when the price comes down they would do such a thing for customers with a long-term contract.