We're pretty sure this was discussed last year during the playoffs when Alfredsson lost his blade in Pens-Sens playoff series, but reader Kyle e-mailed in to shed some more light on it.
Those are the new Bauer Edge holders and blades. Alfredsson in the playoffs last year, Stamos and Ference all were wearing them. There is a button on the holder that releases the blade with a really good tug. I sell them in my shop. http://www.istockanalyst.com/business/news/6392776/bauer-vapor-apx2-skate-hits-retail