Oh snap. Ultrawiders who really want 14mm on a zoom might be happy to see this rumor...
...but I think someone will complain about not having f/2.8 before anyone can say woohoo to a 14-24 lens.
I am more interested in seeing the 135mm f/1.8 DG OS, 85mm f/1.4 DG and 24mm f/1.4 DG Art lenses. These will have an enormous impact on Canon (and also Nikon).
I had the curren Sigma 85mm f/1.4 and only sold it because I needed money and haven't purchased it again waiting to see if Sigma refresh it. Hopefully, the 135mm and 24mm will be priced well below Canon ones.
I love Sigma's Art lenses. I'm with you on these two, although I'd prefer seeing the 85/1.4 come out first simply because the very good Canon 135 is pretty inexpensive. I'd sell my Canon copy if the Sigma Art lens is good, however.
The only other amazing 85 is Canon's, and that's $2100. Unngh...