No, one of the files contains a small image (like 1024x1024 pixels) or something of the areas, and there are tools out there that can extract these files.
If the other areas were shipped with the beta, the beta download size would be a lot larger.
There are currently ~100 areas visible in the game files, and there's supposed to be around 150 or so. Maybe they haven't painted over the other ones yet.
I do recall Josh saying there was at least one 8x8 area in the game (15360x8640px). Defiance Bay Copperlane District, Ondra's Gift and Heratige Hill look to be pretty large maps, the first area of the game looks pretty big (we've seen it in the IGN video etc) and there's a couple of dungeon levels and exterior maps that *could* be big, but yeah it's hard to tell from the small images in the files.