I don't know Kimi that well, I watched his season in 2008. But it seems like ever since he did leave, there has been rumors of his return. I can't imagine he'd join a s*** team, when his stature could easily slip him into the top 4 teams.
When he was at McLaren and Ferrari he came accross as a very shy guy with one word answers but on-track was blisteringly fast when he wanted to be. He went to WRC and all of a sudden in interviews he was smiling, laughing, joking and seemed a totally different person.
Maybe it's just down to teams like Ferrari and McLaren trying to get their drivers to fit quite a staid image in what they or their sponsors perceive as looking professional which is probably fine for some people but not others.
However, this is another in a long line of rumours but I think this is the first time a team that exists has been mentioned that I can think of (was he not supposedly linked to the mythical Stefan GP?).
Raikkonen left F1 still in his prime so there are always going to be rumours circulating about him during the Silly Season.