I think it's not a priority, and personally I like the 3D skins of Nebula/acqua. Flat design has become THE gimmicky thing. It's everywhere, and by definition, it has no character. It's oversimplification most of the time.
There are other critical things to work on, that is my opinion! For example a better and customisable way of organising libraries inside Nebula.
PEOPLE ARE TIRED OF FAKE KNOBS ON A COMPUTER SCREEN!
They will be (and all the other 'gear centric' styled GUI's), completely and totally laughed at within a few years time.
One of the first things that caught my attention at Acqua plugins was their awesome GUI, and, besides their stunning sonic quality, I prefer to work with something that also pleases the eye and get the "wow" factor from my clients. Sometimes I dream about some midi controllers made especially for AA plugins, looking as much as possible as the software, so you could control the plugins with them. I have actually bought the Korg MS-20 midi controller just because I could touch it while controlling their software synth.
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The whole thing with Nebula is the ability to sample hardware and use it in your daw. Nebula strive to be as true to the hardware in every way possible: saturation, frequency, dynamics .. isn't it just natural to make the looks follow the same theme?
Lately have worked in a friend's studio who use Nebula 3 in Cubase and have a long collection of libraries and man ... some of them just sounded amazing by simply inserting them. I remember on using a 1176 and a N*****n eq libraries which were really killers. I will buy it for sure the same moment it will be out (I guess it also will have AAX support).
Long time no news on when this far or near nebula4 ago. We have reached the point that people argue for the 3d interfaces , imagine how boring we expected. and we are on core9 and we have no updates corr in nebulaserver or have idea when will the nebula4 relisted . I happy with Nebula3 but would be nice to start working in a more comfortable such as aqua form . Touch keep waiting , I am afraid .... and go buy patience