Maybe they could look at updating the 35mm f1.4? It may be an excellent lens and reports of issues may be by far in the minority but folk are very vocal about any problems on line and in the eyes of some this lens and maybe one or two others may damage the perception of the system.
If Sony could reduce the internet panic over this and other lenses we could get back to complaining about the old favourites like the lenses being too big, the bodies being too expensive and too big or too small depending on your view and the battery capacity being too feeble
Other than those, maybe a wider than 28mm and a longer than 85mm lens to complete a "classic" prime Sony line up, and of course a compact 35mm f1.8