BMW likes its 7 year cycles:
2001 model, count 7 years starting with 2001
2008 model, count again
2015 model
But there is a chance that could mean early-mid 2014 as a 2015 model. However I think the 2008 M3 came out in early 2008
My warranty expires August 2013, so I was also hoping for a M3 Sedan at that point but I don't think that is going to happen.