I’m personally not betting on this being an issue until next year. I think we’ll continue along the 10.0.X update path for a little while longer.
That said, under the current appStore rules there’s only 2 options for a “10.1”.
1. another free update to exiting users (basically the status quo)
2. Released as a new app at the full price. 10.0.X disappears as a purchase option for new users. But remains for existing users who don’t upgrade as a path to updates or reinstalling the software down the road.
I think we’ll have a clearer picture about the update based on what gets revealed at the NAB press event.