I suppose it makes sense that Stern wouldn't supply details of Premiums yet until the LE's sell out as many guys would save a grand or so and get the premium. A little different but related is that AMD still have LE Wolverine's and Magneto's so if they got LE Avengers in and then Premiums more focus maybe on the Prem's.
But based on the specs the Premium is going to have a Red Apron so that suggests Red trim.
Still I think apart from the mirror effect that you can't really tell with the issued photos so far the Pro translate has the best art, personal thing.