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The 2011 meets emmision requirements for 2012 so I would not expect any change for a while. They spent some coin developing the 2011 motor so they'll want to recoup that investment over more than just 1 year.
sled_guy
Here is what DI boils down to...
$$
DI costs a lot more to put on the sleds.... It also weighs more and adds complexity to the system.
Rotax (E-tec) and Mercury (Optimax) have done it with the two stroke stuff but the cost has gone up as well as complexity.
DI will come about if there is no other way to make SDI or "Clean Fire" work in an economically feasible way.
"Economically feasible" encompasses the points of... Marketing (will customers buy a more expensive sled), R&D (Will it cost too much to make the current (non-DI) system EPA compliant), Assembly/service (how much will it cost to integrate DI into the manufacturing system and service), Power output (will DI increase the power output of the engine to the point where more people will buy the snowmobile based on HP figures in light of the higher cost)