Looking at those pics in the other thread, the Thalia and Shadowmage in particular, I know those are taken from MTGO, but are those likely to be used in anything upcoming? Thalia I'd want just for the art, but an awesome alt art foil of Shadowmage, much as I love Finkel, would be awesome in Lazav.
FYI, the "Con promo" for 2012 is Merfolk Mesmerist. I picked one up at PAX this past weekend. I could scan it, but there's little point - the flavor text is the website, and the expansion symbol is the star. That's the only difference from a pack foil.