The simplest way would be to ask the dealer if you're getting a 2011 model.
As far as getting the newest Mirage Drive, you'll get it. The older version hasn't been sold for YEARS! You could also check the serial number. There's a section there which indicates the year. For something like a Revolution, it hasn't changed much in the past couple of years, so just make sure that the seat has a self inflating backrest, and expandable plugs to hold the seat in place. Also check to make sure the pedals have a small pad on them, so that the last 1/8th of an inch of the pedal is squishy (where you put your foot) The 2009 models didn't have padded pedals, but newer models did. If you're getting all of those features, then it's very likely the newest model. As long as you buy it new from the dealer, you'll still have the warranty no matter how old it is.
I think that most dealers are like my dealer. They don't have a lot of older stock sitting around. I'm sure a few do, but I'd say it's the minority, not the majority.