From the sounds of the rumor that said "it's not going to be like the PS4 Pro" makes me believe that Nintendo is going to stick a Tegra X2 in it but downclock it to X1/Switch levels so that they can lower the power used and improve battery life dramatically. Only a few games will be allowed to have an Extended Battery Life <-> Hi-Resolution toggle in their menus on games that let the resolution fluctuate (Mario, Zelda, Doom).
I'm just hoping for a 3DSwitch with full backwards compatibility but I know I'm in the minority on that.
Shorty's suggestion of limiting what the devs can do with the Pro tech has the side effect of making a Pro model essentially useless to those that do want to buy it. If you use the improved tech considerably then you're flipping the bird to every existing owner that reasonably expected their console to last longer than two years but if you don't make good use of it then you're ripping off the Pro customers that expect some justification for buying a more expensive model. No matter what approach you take you're going to upset some segment of your customer base. In short this approach SUCKS and there's a reason why consoles worked the way they did for 40 years and why they've been able to co-exist in a market with other devices that can play games but aren't specifically designed for that purpose.
What's annoying about this is that the moving goalpost approach to console hardware has already existed. Isn't that what the Sega CD or N64 Expansion Pak essentially were? The difference there is that existing users could upgrade their existing hardware. Now on a handheld that's not a very feasible idea so we get things like the DSi and New 3DS and to have access to a very small amount of games that need the updated tech you have to buy a brand new system. At least those were more affordable than a new console. The Switch is pretty damn expensive to upgrade as are the PS4 Pro and Xbox One X. The Switch has the excuse that as a hybrid it would lose it's portability by offering an upgrade to existing hardware but the PS4 and XB1 in theory could have been designed to allow that.
At least with a PC you can upgrade your RAM or swap out a CPU or graphics card. You don't have to replace the whole damn PC for minor updates. The goalpost moves but you have to ability to make minor tweaks to accommodate that.
We're living in the smartphone era where everyone thinks it's perfectly normal to throw out your $600-1K phone every year or two and buy a nearly identical new one. Frankly, it's weird that Nintendo didn't release a 2018 Switch encased in glass with no headphone jack, non-user-replaceable battery, and minorly thinner bezels/depth.