I have been waiting 2 years for this lens. Hope it is finally true. Can't stand the push/pull design of the current version.
Two years, that's like last week to some of us who've had the "old" one for coming on two decades.
As for the push pull, it would be a shame to lose that feature. This is the BEST feature of this lens, and to want this lens,. and not want to push pull is like wanting a slow Porsche. If you want slow, just get the VW.
The 100-400mm has a lot of room to catch up among today's lenses. It can be weather sealed, it can get better IS, and faster AF, it can be made to be super sharp. All of this would be a plus, but if they ditch the push pull, I am keeping the old one for sure.