brickset.com's Huw recently put out a call for community questions that he'll be asking LEGO designers on a trip to Billund. Post any of your BIONICLE related questions you'd like answered here, and I'll copy them over to brickset's comment section ASAP.
BIONICLE-related questions that have already been asked:
Will Bionicle Generation 2 really end in 2017?
Will there be a Takanuva set for bionicle in the future?
Will the Bionicle team repeat history and make an ancient city like Metru Nui?
Is Bionicle selling well?
Why did LEGO start using hero factory parts for BIONICLE? Why can't they go back to the good old pieces we used to know, I thought they were the best.
For BIONICLE, is the entire story (including characters) planned out ahead of time, both for if it is successful and is continued further than 2017, and if it fails to meet expectations and ends in 2017? Also, to whatever designer from BIONICLE is sent there, which sets did they design? If they made ANY of the 2015 Toa Masters, hug them for me : )
If Bionicle is to continue in 2017, will we see the return of the Toa Mahri with the addition of a new Toa of Ice? Or will there be a new Toa Team?
Was Hero Factory always meant to test out the new system before bringing Bionicle back or did Lego genuinely think it could be a good replacement?