To give you all a better idea of Makeb's scope, it's a planet of equal size to our larger planets and it contains a variety of areas – sprawling mesas, underground caverns, garden estates, and more. It introduces faction-specific storylines, new Heroic missions and bosses, repeatable mission series, and new Datacrons! The 5 new levels will occupy players for a fair amount of time, and there's plenty of content to get you there (including a lot of stuff tucked away for the explorers out there). Keep in mind that this announcement is just the start – as we approach Makeb's launch, you'll see more details about the content coming with Rise of the Hutt Cartel!
So its Belsavis except with no class story then.