The 522 is already available to existing customers - sort of - if you want to own instead of lease.
There are a lot of them for sale on ebay, you have to be careful and get one that is new in the box and never been activated before (look for kidcash7). The most important thing is to communicate with
ceo@echostar.com and let them know you are thinking of buying one, they will advise you to get the R00 and S00 numbers ahead of time, they can check and see if a particular unit is good to be activated.
They are still intended to be lease only but since Echosphere (the manufacturing subsidiary of Echostar) has high restock fees for returns, some retailers (for example if they go out of business) are getting rid of excess stock by selling them.