There are quite a few different Raspberry Pi models, but it's not too difficult to keep them online: the new ones are better.
For example, the new Raspberry Pi 3 Model B + could have a confusing name, but it is a clear improvement over the Raspberry Pi 3 Model B of 2016.
The new board has a slightly faster 1.4 GHz quad-core processor, Bluetooth 4.2 (an update of 4.1) and dual-band Wi-Fi. I'm especially excited about the Wi-Fi upgrade, because for some reason the Verge offices only have 5 GHz available, so we have to use a dishonest 2.4 GHz test network to work with Raspberry Pi and many other devices of IoT.
Raspberry Pi Foundation
Speaking of the Internet of Things, Pi's new Wi-Fi has a "modular compliance certification", which means that if developers use this Pi hardware in their final product, they will not have as much trouble getting the Wi-Fi certified by regulators. In addition, the existence of Wi-Fi dual band Raspberry Pi could be a good sign that the reign of terror of 2.4 GHz on IoT is coming to an end.
In general, the new Pi is extremely similar to its predecessor, especially when it comes to plugs and form factor, which means that it should work perfectly with existing Pi cases and accessories. In addition, the price is still correct: $ 35, as always.