After doing a little research, this is all I could find (and it certainly has not been mentioned on any of the NASCAR forums I participate on):
"9/27/09 Salo To Get First NASCAR Test
Risi Competizione’s Mika Salo will his long-awaited first taste of NASCAR in November, when the Finn will test a Michael Waltrip Racing Sprint Cup Series car on a Florida short track. Salo scaled back his sportscar program this year to pursue his stock car racing dreams."
If it happened or will happen, it looks like he may be driving a Toyota for MWR.