I'm still working on LabVIEW 20xx full time, and I'm not alone. So it isn't this year. 🙂 But NXG releases full versions more than once per year.
Right now, we (NI) aren't publishing a timeline for end of development of LabVIEW 20xx. We have a date we'd like to see, but it'll depend upon NXG code velocity and customer adoption rates. There are already customers who only work in NXG. Each customer will have a different key feature where they say, "Ok, NXG is ready for me." Eventually, it'll be the vast majority of our users.
My hope is that we won't ever announce a planned end date. Instead, we will keep announcing how much more awesome NXG is than a few months ago. And, one day, you all will stop asking me for new features and I'll stop wanting to add them into LV 20xx because everything we need is over in NXG, and why would we stay in 20xx when that other platform has prettier graphics, and VIs that can't crosslink paths, and a reasonable componentization system, and Unicode support, and integrated hardware panels, much more impressive FPGA abilities, and Web integration, and... and that's all the stuff it already has today. NXG already is the platform I really want to be able to use for G. Someday, it'll be the platform I can use. On that day, you all won't care that I'm moving away from LV 20xx because you'll be already over there. And on that day, I'll make a choice: to either go join the NXG team (again -- I did develop on it for four years early on) or finally abandon text programming and become a full-time G programmer.
The only thing I'll say about the roadmap is this: that day is coming. You tell us when.