I liked my Touch well enough when I had it, but what I really missed, what I always missed, was its not having a GPS module. So I often used to carry the Touch plus an Android phone.
Perhaps Apple thought it might cut too much into their iPhone sales to add this feature.
It is relatively easy to integrate GPS into a cellular chip because they use some of the same components. Integrating GPS into a wifi-only device would be more expensive and power consuming.
The main reason why Apple features a GPS is for its Maps navigation app. And this app requires cellular to download maps and compute directions.
Yes, there are several GPS apps like TomTom that are useful for wifi-only devices, but standalone GPS devices for that are very inexpensive. A GPS iPod touch couldn't compete with these inexpensive standalone GPS devices.
And Apple doesn't have much of a need to put in a GPS for location services such as weather and time zone: Apple uses wifi location data for that. Plus, a GPS would unnecessarily waste battery for the average user. iOS doesn't even have an option to turn the GPS off and leave the power-friendly wifi location services on.
They considered the recent change of the 16GB model as a refresh and that's why they say to buy now. Personally, I agree with you, but I don't think the buyers guide is as premeditated as that page would suggest.
I agree. That page's suggestions are based on past events. It conveys the idea that since Apple technically just refreshed the hardware, you should buy the device now because Apple probably won't update it in a while. This idea is based on Apple's history of regular updates and events, and the reasoning has worked many times. But is the page worthy of the name buyer's guide? As to the usefulness of the guide, I guess I would just emphasize "rumors" in "Macrumors buyer's guide."
The question of whether or not the A5-powered 5th gen iPod touch is worth buying now depends on the usage scenario and the iOS version. With iOS 7, it is great for one task at a time for everything but graphic intensive games. But it doesn't work well for switching apps and multiple internet tabs, and graphic intensive games. So it doesn't work well for research or for a main pocket computing device. However, with iOS 6, switching apps and internet tabs is excellent. Intuitively, as Apple adds features, major iOS versions use more resources.