Slaughterhouse is a hip-hop group which contains four lyrical artists who are Joe Budden, Crooked I, Royce Da 5'9 and Joell Ortiz. Each member of the group are regarded as lyricist and when they formed the group people were calling it supergroup in hip-hop. In 2009 they put out there debut album which was called "Slaughterhouse". With rumors in late 2009 of Eminem wanting to sign the group to his record label.
They appeared in the "Forever" video when it was Eminem verse so many people were saying they were going to sign to Em label. Which they are put the deal still taking place now, with Eminem manager tweeting big news for Shady Records early next year. So I reckon it will be Slaughterhouse signing to Eminem label.
With there next album expected to come out next year and the group working with the likes of Eminem, Dr Dre etc. I think you should watch out for Slaughterhouse next year.