Just rumour for now. Announcement to be made this afternoon.
Merc is probably going to become a shareholder, 50% was the figure doing the rounds last week (they own 40% of McLaren at the moment although word is that this will be sold off soon- although they have just agreed to continue engine supply for now.)
Button has been to McLaren to have a look round but this is just politics to get Brawn to get contracts signed. Kimi's management team had two days with Mclaren last week and will probably partner Hamilton. Button will probably stay at Brawn with Heidfeld if his demands are met. If not, Button could be left satnding when the music stops.