It looks like Foyle's Way has been renewed: ITV Renews Foyle's War For Season Eight
I haven't read anything about the next series of Sherlock. I think Martin and Benedict are still filming The Hobbit, so they probably won't be back to filming Sherlock until the fall. Series 2 aired in Britain in early 2012, so I think it will probably be the same for series 3.
I'd love to see more of Irene Adler again! They had such great chemistry that I can't imagine that they wouldn't have her back.