I don't care about docked at all, so hopefully they mean it's a modest improvement for that mode.
Other than the bandwidth improvement and Denver (which wouldn't get used anyway), shouldn't the new SoC run similarly to an X2?
New devkit could mean 6GB for the new model, but I won't hold my breath.
Docked clocks in handheld mode would really be amazing, but I'm not hopeful for that either.
This will be more like a Quality of Life upgrade, not a PS4 Pro. Think New 3DS: they advertised first and foremost the faster OS and browser, better DL speed, improved cameras, super stable 3D. Switch "Pro" will have a better battery life, hopefully some upgrade to the OS (e.g.: with the ability to record more than 30s), maybe a bigger screen. It will likely offer a more stable performance to games like Xenoblade 2, helping them to target a certain framerate/resolution. But I really don't think we will be able to play portable Mario or docked Zelda at 1080p.
I see this sentiment a lot about New 3DS, but how much more could Nintendo have done to say it was a drastically improved model than making exclusive games and offering double the frame rate in some titles. Sure SS 3D was the focus, but the performance improvement wasn't a complete afterthought either. The sad part was the lack of continued investment and the period that it release.