Today, it looks like he confirmed it on Facebook:
Modano is one of the greatest Americans to ever strap on skates and he will be missed my many hockey fans... including me. As mentioned in my previous Modano article, he is a guy that I Hate to Love, because the two NHL franchises he skated for are both Sharks' rivals. However, it's impossible for me not to love the guy. His rookie cards are found in 1990-91 products...
1990/91 OPC Premier #74
1990/91 Upper Deck #46 (American)
1990/91 Upper Deck #46 (French)
which happened to be the first year I started busting packs of hockey. All three of these cards have been in my collection since back in the day. He's one of the handful of athletes that I decided to hang onto over the years.
Two decades later, he's retiring with 561 NHL goals and 1,374 NHL points... both records among American-born NHL skaters.
His retirement is sort of a sweet and sour kind of moment, where I'm glad he won't score anymore goals against the Sharks... but at the same it's sad because NHL fans will no longer have the opportunity to witness him skate.
Sayonara Mr. Modano! You're a class act and a hockey legend. Enjoy your retirement... because you've earned it.