Maybe they will do numbers like 707-v2, 717-v2, etc... v2 meaning version 2.
Maybe: 707 - 2.0, 717,- 2.0, 727 -2.0, etc...
You see a lot of tech stuff numbered that way, so why not? I’m not saying that I like these. I’m just adding an idea I didn’t see mentioned above. If they were than I apologize for overlooking it.