That's a rumour that has been going around for quite some time. I can't see it happening to be honest.
Not a huge fan of it, since most likely EK would start counting those days off in the US as part of your minimum days off a month. I personally rather spend them in Dubai. We're still gonna work 100 hrs a month with less time at home... Doesn't sound like we are gonna benefit in my opinion. Don't forget the fact that jetlag would obviously be worse on return...