Wolverine's secret is that he is a Brony. We'll learn Prof X had an affair with Jean, and that he was never paralyzed. Aunt May will turn out to be Skrull; Mephisto never saved her. Ben Reily will be revealed to be living in Europe, with the Spider-baby.
I guess there will be no more What If? comics, since the watcher can no longer tell them to us.
And I guess we'll never no if sh*t got serious, or if something monumental happened, because the Watcher won't show up.
I would have to say the Yost/Kyle run on X-Force. I felt nothing but sheer exuberance reading that title. Get Mystique and Killable are up there as well. Oh, and the Hulk vs. Wolverine animated feature. I love that movie.
As for Uncanny X-Force, it always seemed more of a Psylocke, Archangel, and Fantomex focused book, rather than a Wolverine book. Other than getting owned in the Dark Angel Saga, and killing Daken in the last arc, I can't think of any stand out Wolverine moments.