Okay, my dad was nice enough to stop by the comic book store today and pick up Captain AmericaL Reborn #4 and Ultimate Comics Spider-Man #4 and they were passing out Sinestro Corps rings, did I miss something, or is DC passing out more of the Lantern rings? 

You missed something lol. For this month there are 7 issues coming out (Doom Patrol yesterday, Blackest Night, etc,etc) that each have a lantern corps ring you get when you buy them. The black lantern ring isn't part of it as they were given away at FCBD this year, but the rest of the spectrum is included (even green).
 
These are a little better than the usual promo GL rings too, they actually fit a human finger, and they all match in size and general shape.

R.E.B.E.L.S. #10 is supposed to come with an Indigo ring.