VMware has a policy on not to comment on future features (even if it is about bringing back a retired feature)
As it was retired, I'm not holding my breath here on hoping they will bring it back.
You can ofcourse always file a feature request (which is better as posting in the forums about it as it ends up in the system)
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I'd like to add my support behind monteleo's dissatisfaction with the decision to remove Unity support for Linux guests.
I am a software development consultant, I have been using VMware Workstation for about 6 years on various projects. I was using V8 up until today when I needed to upgrade to support new guest OS' versions.
I have been using Unity mode for a collection of CentOS, Fedora and other Linux guests and now find myself in a position where my day-to-day work will be affected. Had I known that this decision had been made by VMware I would not have upgraded and would have found another way forward.
I do not know where VMware received their information on this feature not being used very much, but I certainly was not informed of the decision nor consulted about whether I used it.
In version 12.5 there is still no sort of substitute/alternative of unity mode.
I have installed Oracle virtual box that has a similar feature, a bit slower but it is a mature products and works quite well. After many years with VMware I'm planning to switch to vbox in all my linux machines.
It is a pity that VMware does not care customer needs and decided to remove such a key feature.