Good news. I'm not sure that I'll be able to afford it with all the money I've had to spend on USB-C adapters....
I went from a 15" to the 17" in 2011, and then to a 15" in 2017 and ... I still use the 17" as a second computer. I prefer the larger screen. So it's great to know that this will be an option.
One of the biggest issues that I don't think has ever been properly addressed is that as screen resolution increased the size of fonts in Calendar, Contacts, and a few other Apple native apps do not have a text size option-- so things just keep getting smaller and smaller. (Changing the whole screen res is a bad option.) Also other applications, like my word processor of choice, Nisus Writer Pro, the menus are still the same size they were 20 years ago. Adobe Illustrator, Photoshop, the handle and corner point sizes have never been adjustable. If like me you've been using Illustrator for 25 years, it's like these things are just getting more and more difficult to use as screen resolutions increase (if somehow Adobe's changed this in the post CS5 monthly-shakedown, I'm not really interested. If they haven't and you're paying $30-$60 a month to poke poke poke for a drawing point or handle, what are you really paying for?). A 16" won't solve these problems, but it will be nice. I hope someone at Apple has figured out that they need to really dial up some of their basic applications to take advantage of a larger high res screen. (How about expandable mini-notes for a word processor. How about a major redesign of word processors and spreadsheets?)
What I've found traveling with a MacBook Pro is that as devices get lighter, they really aren't getting that much lighter, just smaller. The power blocks and the back-up external drive, sleeve, etc... instead of a 4 pound machine being replaced by a 3 pound machine, are more like 7 pounds of gear now weighing 6 pounds. Instead of a 25% reduction, it's more like 14%. The weight savings is not really worth the smaller screen size. I think the larger screens will make seeing a MacBookPro stand out from the crowd of laptops as it once did. (Just my two cents. If any of this is rubbish. Thanks in advance for setting me straight.)