Considering how easy it is to restore and how easy ziphone makes it to hack i would say go ahead unless you love searching youtube from your phone and using the locate me feature.
Either way it is verry likely that this "Dellay" is just misinformation. Not to say businessweek is not a relliable news source but they have gotten things wrong before.
Just as I am not adding gear live to my list of daily news site checks im not about to think apple is going to wait till the 29th to say oops sorry looks like there will be a delay.