The series is a darkly comedic fantasy comic. The series is published by Image Comics and as of this post had four issues. I'm going to be honest, I love these ladies. The group is led by the rockabilly elven wizard, Hannah. Muscle is provided by the dwarven hipster, Violet. Heals are provided by the atheist cleric, Dee (who's parents happen to worship a blood-drinking squid god). The party is rounded out by the sweet and cheerful (not to mention candy and drug loving) smidgen (think hobbit) rogue Betty.
I've read all of the current issues and none of them have disappointed. Besides the Rat Queens themselves, there are other "mercenary groups" in the series, my favorite being The Daves, a four man adventuring party made up of men named Dave.
The creator Kurtis J Wiebe has said this comic is more the fan's comic than his. He's encouraged like the comic's Facebook page for early info, behind the scenes stuff, and to share their fan art and cosplay. In the letters section of one of the issues he even asked people to write in discussing what edition of D&D they're playing and to talk about their characters. A few D&D/fantasy themed mixed drink recipes have been included in the letters section too.
If you're looking for something to read check out Rat Queens. With only four issues out, it would be easy to catch up on the series. You can read a free preview here.