I can't wait for the new 50mm IS that is sharper and more consistent with AF. I think Canon should release it already, in time for the holiday season to help boost interest in the 70D. Since video is its strong point, it makes logical sense for them to offer both at the same time.
I agree with a 35mm 1.4L II to top the Sigma.
I also want to see a new 50L soon that is sharper and better with AF.
A wide angle zoom L seems possible, as well as an 85mm 1.8 IS.
135L IS would rock.
And Yes to more pancakes! A 35-50 2.8 IS Pancake perhaps....?