As a lot of people has pointed out, this seems problematic:
I wont go and say it wont work or anything. You guys might have been working on the DLC for a long time and have it actually (decently) ready since a while (though I can't 100% believe that). Maybe some details are most of what remains etc. I can't know that for sure. I would also expect that some thought came with this all and we are thinking that it will be worse than it will actually will etc.
However, I can't in good faith feel at ease. We have the last year as reference, the release cadence was intense and there was no 4.0 there, and we have suffered with the issues for a while now. I really hope this is not the case, but if it is. I would at least expect that the post release patches are better than the ones we got.
We are also still missing some details on the still missing patch to rough up some of the remaining issues on season 8. Any chance we get some info on it? It seems like it is never happening at this point. As I find it hard to believe that it will come after the DLC.
All in all, please do not do the same thing that has been done in the past. With so much people being excited for the genetics rework after the entire machine fiasco (fiasco balance and design wise) if it is underwhelming, then they (me included) will get the pitchforks. Add the beta on top, which is even more important due to the magnitude of the changes, and we are in thin ice (metaphorically speaking).