In her entry in “Endless Structures” in Structure & Surprise: Engaging Poetic Turns, Rachel Zucker references three poems that turn to sudden revelation near their conclusion. Here are links to those poems:
Here is Mark Doty on Rilke’s great poem.
Other poems that feature a sudden, final revelation include:
“Body as Argument,” by Jillian Weise (in The Amputee’s Guide to Sex (Soft Skull, 2007), p. 81).