[kale]

Bluetooth v4.2 is not yet 2 years old. Bluetooth v5 is coming out in the next couple of years.

Bluetooth 4.0 really dropped power requirements for a lot of use cases. It's an adapting standard that's not sitting still by any stretch.

[arcticbull]

Bluetooth 4.0 is completely unrelated to Bluetooth 3 but for the name. It was a separate standard developed by Nokia and brought wholesale to the Bluetooth SIG and they effectively told them that's what 4.0 would be ^_^