RickyCigs
Banned
They'll all still receive the updates. The HDX series only gets an improved DSP chip for more processing power and only meaning you can put more effects in your chain. The software is still the same. Current Pro owners would only want to upgrade if they continually hit the DSP limit. I haven't since I don't have a need to fill all the spaces with effects in the signal chain so I don't mind that there's an updated model.
And what sources tell you that we'll get even one more update? It's been months without even so much as a hint that one is coming.