Sequel Hook: Samhain's appearance in Hyperion's epilogue scene. Hyperion's ending scene, complete with omninous 'the future was bright... for now' pretty much slapped 'there's a sequel' across the sky in big shiny letter. That, and Word of God had already pretty much confirmed it.
Weapon of Choice: Dragon-slaying Ajax wields a vicious halberd in his base form. Upon ascension to his more knightly form he gains a lance and shield; his final angelic form gives him weapons made of solidified light.