From just what we know so far, I'm going to say that it does look more like a big GP than a full EP. My measure is that an EP should have features that can apply to a broad segment of the population, while GPs are a much more focused experience. "Pet owners" are more broadly applicable than "vampires". Celebrities have always struck me as more towards the niche end of the scale.
I'm hoping to be proven wrong, and that there are extra systems that are more engaging without turning everybody into a celebrity or celebrity worshiper. My biggest worry, though, is that the GF blurb only mentions fame, the acting career, the new world, and the glitzy new objects. The GT teaser blurb at least mentioned clubs, and the Seasons blurb mentions holidays. I expect a lot of depth to the fame system. But it's still ultimately a case where if too many sims are involved, it becomes meaningless.
