I doubt that you will ever see a RTR "FACTORY" turbo.
The cat RTR's are an aftermarket setup from Boondocker Performance that you can order thru a dealer.... never would they pass EPA.
I'm confident if Polaris did not have to pass EPA.. the fix would already be out on the 800's.
At the corporate level, were the business has to make money for the stock holders, comply with saftety regulations, EPA mandates for emissions, and durability in the hands of consumers that could break an anvil are all limiting factors in the design of a snowmobile for public release.
I think that discontinuing the 700 CFi was a mistake but there are many aspects of the decision process that were not privy to and weather there are enough units sold to suppport the costs.