Loke2112 is referring to this feature in the iOS 6 keynote where iOS would switch to your data connection when your wifi signal had issues. For example, if you were still in wifi range but barely had signal, it would intelligently switch out to data instead of waiting for you to fully leave the wifi signal area. If your internet connection cut out but your wireless router was still working fine (which happens to me every now and then), iOS would realize that and switch to data until the full internet connection via wifi were restored. Apple didn't include it in the final release and iOS would definitely be better with this fairly basic feature.