Hubble has revealed a fifth moon of Pluto
John Spencer, one of the NH project scientists says in UMSF forum:
"We'll be doing deep searches for additional satellites with LORRI as we approach Pluto- the last search will be about 18 days before closest approach, and our last chance to change to our pre-designed bail-out trajectory will be ten days before closest approach. So we'll be very busy that week! The amount of fuel needed to switch to the bail-out trajectory will be quite small, so it shouldn't affect the KBO encounters very much. But of course Pluto is our highest priority, so if we find we do need to sacrifice a KBO encounter in order to keep us safe at Pluto, it won't be a difficult decision." (link to post)
Things are getting crowded out there!