I suspect that this shouldn't be thought about too hard - unfortunately. It's probably going to simply turn out to be a deluxe wacked out version of the Cop Joker, but that's a pretty major let down as far as I'm concerned. It seems like a lot of hype over a variation on a Joker figure already announced. I'd hope that this much effort would only go in to something worth the effort.
I'm still holding out for Gordon, although we know the odds of that are awfully slim. However, that doesn't mean they haven't been keeping it very secret, even going so far as to give out bad info to avoid anyone leaking it early. The clue makes the most sense for Gordon, since he is the one that specifically talks about the Joker's clothes in relationship to evidence "Clothes are custom..."
So yea, against all odds, I think HT managed to secure the rights to Gordon/Oldman without letting us know, and that's going to be the big announcement. If it ends up being an alternative version of the Cop Joker, I'll be colored bored.