I've seen reviews of Single Ladies, Run The World (Girls), Deja Vu... They all read like the first reactions to this do. I don't think this will see SL success, more like RTW or DV or even less, but it's sure to be one hell of a song and she better not pay it dust on her next tour because this is going to knock live
Also, someone on Beyhive forum who has had the songs for a few weeks said this is definitely not the hook but they haven't said which part of the song it is. I have my money on outro or bridge.