2 of this 3 Specs are not really any thing to rumor about I think.
Of course it will have an internal flash, which none-fullframe doesn't. And it is still aimed at enthusiasts not only pros.
Wifi and GPS are also almost a cetain thing, as it will become standard equipment for most cameras on that level and probably even on more entryclass level cameras.
The 1D topplate is more of a rumor and I hope it will stay just a rumor. The modedial is a good thing.