Saw the set this morning at Walmart, it came with Elsa, Olaf and a huge Ice Monster. Pretty cool it was 29.96 US. Sorry no pics, no camera. Its not listed on their website either
Yeah, the 3-pack has been in stores for a month or so. I thought someone had posted a thread already, but I guess not.
It comes with the regular size (~3.75") Elsa & Olaf, and then it comes with Marshmallow as well. I'm not sure that he's a 6", but definitely bigger than the regular ones.