Not really. Reduces bestial wrath and rapid fire for BM (the rest are defensive abilities), and black arrow and rapid fire for SV. See Koenig's post above for links.
Combine t16 2pc with this trinket and rapid fire's uptime will be substantial.
edit: for those that missed on page one. the CD reduction trinket works on these abilties
BM http://ptr.wowdb.com/spells/145964-readiness
SV http://ptr.wowdb.com/spells/145966-readiness
MM http://ptr.wowdb.com/spells/145965-readiness (they havent picked a 5th yet for MM)