Regarding vengeance, we raided tonight and I only felt a big difference in vengeance on Spirit Kings (normal 10 man). In the two weeks prior, I was near top damage and top healing, and tonight I was below both healers and almost last on damage.
Ghostcrawler said it was a bug fix, so I'm assuming if the result is a negative impact on monk tanking they'll fix it sometime. Hopefully. I think we're fine for now, but my experience is limited to 10 man normal modes so ymmv.
In other news I got the Qiang's polearm tonight! Went ahead and put Dancing Steel on it, pretty awesome.