Thing is their IdeaPad Yoga isn't an X220 replacement. X220 offers two full-speed cores (2x3.2 GHz) with higher TDP, 16GByte RAM, ExpressCard 54 slot, optional WWAN, matte display, TrackPoint, ThinkVantage system update, replaceable batteries up to 95Wh, yada yada yada.

I'm keeping my fingers crossed for the X240 to not become an Ultrabook. So far it looks like a downgrade, or at most like Lenovo managed to put in FullHD over a course of two years.