Yeah, I just saw that on another message board I frequent.
It really is awful looking. Could be legit, being considering the logosondemand part...
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However, considering that, I imagine that if you're a member of logosondemand.net and you do leak logos, there are some sort of penalties -- especially when a team is as set to wait to reveal their logos as the Sabres seem to be.
That said, that is the Official Stylesheet that the NHL uses. But, the following was created by somebody on the forums of a graphic design, particularly sports logos, community I frequent to show that it'd be easy to fake...
http://files.clarkrasmussen.com/board_posts/sabres.jpg
So it could very easily be a fake.