To learn which neuroimaging data derivatives (intermediate or final analysis outputs) matter most to people conducting analyses and reusing data we have put together a survey: https://goo.gl/forms/5ghpVbiiPHd8BN153 

Please take a moment and fill it and most importantly share it with your colleagues - this feedback is extremely helpful and will help to focus BIDS Derivatives standardization work. 

I know the survey is not exhaustive (for example does not include very important modalities such as EEG, MEG, iEEG or PET). I hope we will be able to perform followup surveys in the near future to fill in those gaps.