Certain aspects of all this make it seem as if it could be true.
Needless to say the deal with MAG certainly helps to make this more likely to be true.
The choice of routes seem realistic on the whole (although I'd doubt Newcastle).
Funnily enough, the start dates seem convincing. EZY do not get any new aircraft until 2015 I believe. So after the peak July/August period, some bases may lose an aircraft or two allowing EZY to allocate them to Stansted from September.
Also, no EZY services are currently on sale after 14th September 2014 at all, so if true this could maybe be announced when flights after Sept 14 are released for sale.
Having said all this, my guess would be that somebody is just fooling around on Wikipedia and that none of this is true, although I'd love to be proven wrong. Almost seems too good to be true!