OK, here are 2 potential spoiler pics from different sources.
[Spoiler (click to open)]
THIS Tumblr blog posted the French promo for 3X09 (with their translation of the dialogue) and when I paused it at around 00:35 I saw this:
Doesn't that look like Edward Teach?
And a poster on IMDB posted this picture, which they took from one of the promos before the season:
I don't believe we've seen that scene, unless it's a deleted one. Don't the people in the background look like they're in uniform? Is Teach on an English or Spanish vessel? He still has one of his guns, so I don't think he was taken captive. So what's going on here? Is Dadbeard coming to the rescue or has he sided against the Pirates?
SOURCES: #1, #2, #3