The EFX R2 that is displayed is actually an all metal droid belonging to an R2 Builders club member. It is pretty much just for display at the con and will more than likely not represent what will actually be produced if they ever get around to producing anything.
Seriously, Disney is letting EFX keep a license when all they are doing is borrowing props from unlicensed prop makers and claiming they may one day make something like that maybe. WTH?????