I would like to propose that @Azani's source did not see the word "Voloctoreb" but instead saw something like "Volecterb." The latter word is an anagram for "Clever Bot," which I think is a far more likely code name for a new constraction theme. Either that, or Lego anticipated being hacked by a bot, and left that word for the bot to find. All they'd have to do is periodically google the ultimately obscure "Volecterb" to find the hacker. If I'm right it takes them to this thread, back to Voloctoreb, and back to Azani's source.
I'd also like to go ahead and examine the timing of this theme. In order to make a 2018 release, they would have to start planning it (at the very latest) around the same time the decision to end Bionicle was made. If true, it supports the hypothesis that Bionicle was not a commercial failure, because then the 2018 theme would be scrapped as well.
But here lies the rub: Why replace a line which is not doing poorly (assuming the above is true) with another random theme that won't be ready for another two years? The answer which makes the most sense to me in this scenario is that Lego decided to pull a Ninjago to fix G2's issues, rather than let G2 run it's three year course. "Lov-A-Reboot" has an anagram very similar to Voloctereb, "VOLOATEREB"
The conclusion I just came to, however, makes absolutely no sense what-so-ever. Why cancel Bionicle to pull a Ninjago? Just let it run to conclusion, and then bring it back again a few years later. This is a contradiction. Based on this, I doubt that there will be a new theme. The timing just doesn't make sense.