Looks fake to me too.
It looks like a merger of current 100L Macro and 24-70 f/2.8 L USM II.
But, who's to say that it won't end up looking like a merger of the two. It's likely to have the same IS system as the 100L, and if they are moving it to f/1.8 from f/2, it might need a larger front element (thus the 82mm). In fact, any new 135L would probably look really similar to the 100L based on the focal length.
I agree it looks photoshopped, but, the reason its a believable one is because the lens will probably look very similar.
maybe some dudes will fleabay their Mk.1's and we can get them at nice prices...
They are already at nice prices. That said, if Canon releases a new one at $2000+, you won't get the Mk. 1 for very cheap. If anything, it'd increase the prices as everyone who wanted a 135L can't afford the $2k and will settle for the Mk1 at $1000ish...rather than the $800ish they go for now.
I'd say $1700 for the new 135L, but, IS might push it up a little more