Guys get real. The 50L 1.2 was released on 2006, Its very unlikely to be updated.
Now for the 35L and 135L, its about time.
yes. the 135 was excellent when it was first released, but compared to the new 70-200 f/2.8 L II you can tell it's getting long in the tooth. when a supposedly excellent prime lens falls behind a zoom lens, no matter how excellent a zoom lens, it's a signal that it's time to start reworking the prime lens.
a 135 f/2 L IS would be awesome, but I'd take a new 135 f/2 without IS on it
Just wondering where you think it falls short? I think the 135 is pretty amazing TBH, sharp and with superb bokeh. I could see the advantage in an IS version, but that's about it.