Its tough to get excited about something that there seems to be so little known about. All I see is that it will have high magic, lots of steampunk kind of stuff, traditional D&D fantasy, lost world (dinosaurs), yadda, yadda yadda. Is it going to be like going to DisneyWorld? "Hey, we're in Tomorrowland, let's take the train over to Fantasyland" Or will it actually be integrated in an intriguing way that will set it apart?
I love the Scarred Lands because of the background for the setting. You understand the things that have happened that make the world the way it is. You know by reading all of a few pages that it is a place that is trying to dig its way out from devastation, you know the Gods are a real and central part of the world, you know the reason for the conflict between the Divine Races and the Titanspawn, and you know that it is not just a world of good vs. evil, there are deep political rivalries as well. Its a cohesive world, not just a place of "wouldn't it be cool if your fighter could board a bullet train."
I'm not slamming Eberron, I'm just saying there seems little to get excited about yet. Wait until they give us more and then I'll make a decision as to buy it or not, although I personally have my doubts I'll spend the money I could use on Scarred Lands books on a new setting.