Last year around the deadline the following depth goalies all signed NHL deals in January/February after being previously unsigned/on AHL deals:
Ken Appelby (WPG); Chris Driedger (FLA); Adam Wilcox (BUF); Parker Milner (WAS); Jeremy Smith (NYI); Tom McCollum (NAS); Michael Leighton (VAN)
All but Driedger are currently unsigned. Teams just like to have an excess of goalie depth at this time of year. I wouldn't be shocked to see deals for some more goalies but most teams have seem to have more goalies on NHL deals this year.