Yoga 11S - wait for haswell?

I would like to buy a Windows 8 convertible laptop and I think the Yoga 11S looks almost perfect for what I need. I am just wondering if I should wait for a Haswell refresh - does anybody think that is coming soon? If the only improvement Haswell will bring is battery life, I would prefer not to wait, as battery life is not that important to me. And if the Haswell versions will not be released until the holiday season I would prefer not to wait that long. Does anybody have any predictions on when the Yoga haswell refresh will be released?