I think the latest public update on this is the following quote from "Welcome Meet Qt (Qt Virtual Tech Con 2020):
> Yes, of course Qt will remain open-source. I don't think anybody in our company is making any claims other than that and... let's be very practical: the only way we're going to have a big ecosystem going forward is to have open-source available. And we will have patch releases available for 5.15 until Qt 6.0 comes out and after that we will focus our efforts on 6.0. Having said that of course we will do the patch releases for our commercial only branch -- for our paying customers. But rest assured there's going to be a lot of different patch releases available for open-source and you'll always have the latest available. [1]
That sounds a bit vague :) I read into it that open source users get the latest patch release, as in 5.15.3 for example. But major/minor releases are first served to commercial users, like 6.0 and 6.1.
> Yes, of course Qt will remain open-source. I don't think anybody in our company is making any claims other than that and... let's be very practical: the only way we're going to have a big ecosystem going forward is to have open-source available. And we will have patch releases available for 5.15 until Qt 6.0 comes out and after that we will focus our efforts on 6.0. Having said that of course we will do the patch releases for our commercial only branch -- for our paying customers. But rest assured there's going to be a lot of different patch releases available for open-source and you'll always have the latest available. [1]
[1] - https://www.youtube.com/watch?v=Ioons0BMSvs