I personally think there will be some refinement in 2011 but not as much as some people may think. Look at the 2010 CRF450, the 2009 CRF had some fairly major issues and I don't think they did much about them in 2010. Also look at the 2006 YZ450F, great brand new bike and they did not do much with it either in 2007. I think the 2010 YZF is a great bike and there will be fairly minor refinements to it in 2011 but nothing that would keep me from buying a 2010 because recent history shows it will most likely be close to the same bike. None of this is fact just my opinion so take it for what it is worth.