VSL has already stated numerous times on this forum that its on the roadmap, but there is no timeline they can give at this time for when exactly we will see it. They have already told us a dozen times, they are working on it.
One thing you need to understand is that VST3 is a huge change from VST2 in terms of how its coded in any VST3 hosting app.. Its not a small change. Its a very very large change, especially for a sophisticated host software such as VePro. If it were an easy thing to add, I'm sure VSL would have released it already a long time ago.
In the meantime, I suggest you consider using a sub-hosting plugin for K7 as a work around. DDMF MetaPlugin, DDMF SuperPlugin, Kushview Element, PlogueBidule, perhaps even KompleteKontrol, are all possible plugins which come in VST2 form and can host VST3 plugins inside of themselves..which will essentially allow you to use K7 inside VePro7 right now.
Myself, I am still basically avoiding VST3 plugins. I'm still using K6 and have no "pressing" need to run out and get K7 any time soon. The VST3 spec also has some interesting design problems that can sometimes affect midi in problematic ways that does not exist with VST2, so me personally I always choose VST2 whenever possible and I will continue to do that as long as I can until it truly becomes a situation such that for example, there may be some sample library that only works on K7 which is only VST3... But we're just not there yet, there are really only a few isolated situations where VST3 is a hard requirement.
Just a suggestion.