Well, tell me how that works. Suppose God 'knows' that I'm going to say 'yes,' but then I change my mind and say, 'no.' Doesn't that leave us with the old determinist dodge, "Well, God knew he was going to change his mind, so he never really said 'yes'."
I am familiar with Mr. Wesley's explanation of God being outside 'history' and therefore can have (simple) foreknowledge. The problem is that it takes God outside of sequentiality. That's why open theism has some appeal.