Bioshock 2 trophy went from 100% to 87% today? Anybody know why..

Not that its a huge deal or anything, but today I happened to be looking at my trophies and noticed that Bioshock 2 went down from 100& complete to 87% complete for some reason. I already bought the add-on pack and have finished those trophies too. Is there another Add-on pack that is about to be released? Like I said, not a big deal, I'm just wondering if anybody else noticed this on their list or if you know why

DLC...

downloadable content or an expansion pack is probably coming out soon...

Thanks, I was guessing it was that. I only asked because I hadn't heard of a new DLC annoucement beyond the general we will be doing more after the last one. Maybe that means its coming out soon - I also thought it could have been after the PSN update the other day but I'm sure I've looked at it since then and it was still 100% so it seemed unlikely.