It is not a recall (not a safety issue), but rather a warranty bulletin or warranty campaign. This applies to 2011 800 e-tecs. The info posted above for Warranty Campaign 2011-18 is for sleds ridden at high elevation and is correct I believe.
The Warranty Campaign 2011-19 applies to 800 e-tecs ridden primarily below 4,000 ft. The reason for the bulletin according to BRP is that under certain riding conditions, the piston ring locating pins may not meet long term disability requirements and may fail leading to severe engine damage. BRP will replace pistons with a new design. This applies to 800 e-tec sleds once when they reach 3,125 miles and on sleds that are ridden generally at an altitude of 4,000 feet and below. Also, as part of this, BRP will also inspect the crankshaft PTO inner bearing and replace the crankshaft if defective. This warranty bulletin applies until October 2015. This does not apply to the 2012 models since they have improved components.
I obtained this information from dootalk and appears 100% legitimate.
I only have 1,000 miles on my e-tec, so I have a ways to go before this will apply to me.