No really sure why this just coming to light now, not a big secret MERX the Canadian goverment tender site has had the info up since 2011 when the tender was issued?
CSAR has an article on it dated 11 Aug 2011, so congats on yahoo for catching a story late, guess it was not newsworthy till it went into testing.
And It not really a stealth Snowmobile it an Gas-Electric Hybrid-Drive Light Over Snow Vehicle. With a quietier enginer it makes harder to hear. Saying that it is stealth impplies that it can aviod dectection by radar
http://www.casr.ca/doc-npp-hybrid-snowmobile.htm