The L treatment
There are a few reports out there that Canon will finally replace the TS-E 45mm and TS-E 90mm in 2013. We should expect a replacement announcement in Q2 of 2013. Both of these lenses have long been rumoured to be on the replacement docket. No one has come out and said they'll be “L” replacements, but I think it only makes sense. This would give Canon the largest high end tilt-shift lineup on the market.
Also mentioned in the same announcement breath, was Canon answer to Nikon's 14-24 f/2.8. A very long awaited lens.