Yup, unfortunately spears were changed to Strength-based as a seemingly last-minute change, possibly due to the decision to make most (if not all) of the Rogue damage-dealing abilities exclusive to daggers. I guess once they weighted Dex-build characters toward using Daggers and Bows/Crossbows, they felt that there was little to no point in leaving Spears as Dex-based weapons. As of now, the only two-handed weapons that are Dex-based are Bows and Crossbows.
I feel your pain, since one of my favorite characters during the betas was a spear-wielding rogue.
