I was really looking forward to this fix in this update. Hopefully in the next one.
Just to verify, do you use Windows 10 or OSX? I use a 49" 4k display as well, in Windows 10, from a distance of about 70 cm, and for me the HiDPI @ 100 % scaling is too small to comfortably see the texts and other graphics. I can just see for example the fonts in the inspector area, but it is a struggle. 125 % scaling would work well already with this screen size. I typically use 150 % scaling in windows 10. In comparison, Bitwig Studio lets you to change the scaling with 25 % intervals, independent on the scaling setting of windows 10. These days there are so many different hi-res displays available that fixed software scalings do not work for all.
Steinberg really needs to enable HiDPI scaling settings 125 % and 150 % in the next update. My brand new Cubase license is currently sitting unused, waiting for the scaling issue to be fixed. In the meantime, I use Bitwig. This situation is very annoying.