Sanna Nielsen will debut as the host and with her will be Robin Paulsson, a very well known television host, also him making his MF debut. We also know one of the contestants already, Kalle Johansson. He won the Svensktoppen nästä 2014 contest and the award was a ticket to Melodifestivalen 2015.
Måns Zelmerlöv is supposed to be making a comeback to the contest, as are Lili & Susie, Linus Svenning and Charlotte Perrelli. Sean Banan has also made it clear he has sent a song.
Other names rumored are Hasse Andersson, Samir Badran & Viktor Frisk, Isa Tengbald, Rickard Söderberg & Elize Ryd (of Amaranthe), Jon Henrik Fjällgren, Midnight Boy, Andreas Weise, Linnea Henriksson, Elisa Lindström, Jens Hult, Kristin Amparo, Albin, Alex Jafarzadeh, Top Cats, Marie Picasso, Rabih Jaber, De Vet Du, Alexander Vasiliou, Alvaro Estrella, Le Tac, Sara Li, Benjamin "Pernilla's son" Wahlgren and Velvet. Most of these unknown to this blogger I'm afraid.
Also possible comeback for Jan Johansen, Magnus Carlsson, Jessica Andersson.... a few more days and we will know for sure!