JEP 110: leeway for API changes?

[Anthony Vanelverdinghe]

Hi

With the JDK's "Feature Complete" milestone coming up next week: how 
much leeway is there still for API changes? I've made API suggestions 
(a.o. in [1]), ranging from changing 
HttpResponse.multiProcessor::onStart's return type (from BiFunction<..., 
Boolean> to BiPredicate), to building on the j.u.c.Flow API & 
eliminating HttpResponse.MultiProcessor. So I'm wondering what's still 
on on the table for JEP 110 w.r.t. API changes?

[1] http://mail.openjdk.java.net/pipermail/net-dev/2016-March/009608.html

Kind regards,
Anthony