Right, it is currently April 1st in Asia, but this interview occurred on March 31st, or earlier. That said, Howard has mentioned things in interviews before that haven't come to fruition for whatever reason, but I doubt he's purposely trolling for the sake of a prank.
I believe it is happening, but of course I will be more confident once we see official specs and pics + a pre-order link. Not even backstage prototype pics are "official" enough to guarantee an imminent release (Arkham City Batman; Batsignal; TDKR armory)...an interview is even less of a confirmation than that.