I've never gotten a freebie (well, not yet, I took advantage of the $21+ freebie last night, can't wait till it gets here!), but I've seen people get 4.0's or FB Elite on rare occasion. It does seem like you should assume it's a Kawaii, though.
I'm interested to know as well. I've gotten a Kawaii both times when the coupon code didn't specify a minimum $ value. I'm not a fan of Kawaii, so I don't usually go for these deals anymore.
Re: KC Freebie
For the no specified value I have always gotten Kawaii.
For 17+ I've gotten fuzzibunz.
For 21 or 23+ I've gotten grovia aio.
Generally I request snaps so I don't know if that makes a difference.