Killing off the current 600 and 800 and going to 650/850 seems like a reasonable prediction to me. Doo pretty much did that, although obviously with a new 600 to compliment the 850; given that they're only keeping two engines in the performance-oriented range, I'm guessing they're not seeing sales potential for more than two motors. I doubt Polaris is seeing anything different, and Doo has more resources to stick their neck out if anyone thought it'd work. I'd love to see a new 600 "fleet" motor, a 700-class stretched version of that motor (both lighter than the 850), and of course the 850 carrying the top spot, but a 650 would split the difference and simplify the lineup. My one big "please Polaris" on that is that make a Pro-RMK that's actually lighter than the 850. Could be 10lbs lighter; there's no reason for it to be heavier...