that is not really true, everybody can register in the forum, it is public, linked direct on the webpage (vrayforc4d.com), and can access the update info thread, as well as any other threads. thats was and is so. there we post regularly the things we work on and inform users or whoever is interested on the state of the update progress. so nothing is hidden, all can read all infos, user’s posts and threads, we try to be very transparent.
the render engine (V-Ray core) used is developed by Chaosgroup.
that the wait, which was longer than our initial plan until these new features are ready, is of course not nice (also not for us) that is clear. still the work has to be done to make those wished features possible within the c4d sdk. the last update with fixes and new vray core 2.35 (from Chaosgroup) had been not so long ago in late November by the way, fixing most known bugs. several other fix updates the months before. We try to give updates whenever possible. Our team and chaosgroup work continuous on the software. Our dev team is one of the biggest among the c4d plugins and engines.
also maxon or other companies don't tell you their internal dates of releases or planned features of forthcoming releases (for good reasons, as in all software things can change, tend to take longer, etc). we tell and show the users at least what we work on. that we do not publish a date, doesnst mean we have no time plans and milestones. we try to give as much info as possible, and to bring in as many features as possible to c4d. over time we will have same as maya or max vray, thats why we do the big update work atm. which engine one prefer or what you need greatly depends on what you make overall obviously.