http://spacenews.com/report-calls-for-iss-research-transition-plan-and-use-of-alternative-platforms/

The midterm assessment of the 2011 decadal survey on life and physical sciences research at NASA,
released by a committee of the National Academies Dec. 15, supported efforts by NASA to increase research on the ISS,
but warned the agency needed to act soon to develop a transition plan for such research after 2024.

HTV-Xのミッション要求決定は12月6日だったな。