Daniel, I ignore the WiFi feature Dell is talking about. I'm not interested in that particular feature. I would only use the GPS functionality.
The 'WiFi positioning' uses a database of known WiFi networks to triangulate your approximate location. But if the database contains no WiFi networks in your area, then you will not be able to use that functionality. The accuracy and the availability of GPS service is far superior to 'WiFi positioning'. They say that GPS inside buildings doesn't work, and that's where WiFi positioning could work, but I personally have no need for GPS indoor. And I do not believe they have managed to even map significantly large areas, so I personally doubt WiFi positioning has any practical use for us. But I don't think you pay for it any monthly fee.
Users of an older version of Microsoft Streets and Trips few years ago were able to test such functionality. It was an interesting example of new technology, but it just didn't have practical use because few people I know ever found themselves in an area that had WiFi networks in its database. There was no fee for it. Streets & Trips installation program installed a file on your computer that contained a list of a few hundreds of thousands of known WiFi networks. When you started S&T, if this feature was enabled, S&T would compare Mac addresses of networks in the database with Mac addresses of any available WiFi networks your laptop could see. Not a single time I tested the feature the feature detected where I was via WiFi positioning. My USB GPS receiver connected to my laptop and S&T worked flawlessly, though.
To be fair, the technology might have improved over the past couple of years, so I shouldn't make any judgements before I try it. But honestly, if I were to buy this new Dell Mini 10, I would only be interested in the GPS, not the Wifi positioning.