The current patch is 0.0125 , which was administered two or three days ago. Patches usually go out for two to three weeks, except for unforeseen situations (as with the last patch, for which delay had a serious reason of a personal matter.
The last few patches have made significant improvements to the vision, apart from all the other fixes and improvements, and the next few patchies that will come out in December will contain general changes to key parts of the game such as weapon balance (rework?), according to some other info maybe introduction to actual story mode and other majior improvement. This is the reasons the Dev will take a little more time to bring the next patch, because it will consist some general additions.
So, in short - no it's not abandoned, on the contrary - we expect some interesting new stuff at the end of the year in