Yeah, the game will likely have fast travelling between areas, in the same way as Baldur's Gate 2 does: once you know of a location, you can go there. Creating
all the landmass in between for people who would rather walk the entire way is not really feasible without tiling and repeated use of areas, this
again defeats the point, since the only real reason to walk the entire way by foot would be to have a more realistic experience (ruined by repeated tiles), or to experience the scenery (there's no way they could fill it with enough content to make it worthwhile).
While it could be amazing to have a large seamless area to explore, I don't think they should go the route of Skyrim and create a huge & awesome, but rather soulless, world. I'd rather see many smaller, separate, highly differentiated, and content rich areas. I want to experience an awesome story, not a glorified Google Maps

If they did have the manpower, time, and money to actually make a seamless world filled with the same amount of content and diversity as we'd see in a BG2 style map, I'm all for it. That's why I think it could possibly make for a good expansion to expand a smaller area of the map to be a large, more seamless, one. Just to see what it'd be like

.
Edit,
Example of a BG2 style map, with 20 exterior areas. Imagine each area is 20,000px x 20,000px:

Here's an example with these 20 exterior areas placed beside each other (80,000px x 100,000px). Visualizing how much work would be involved in creating the entire map as one seamless world:
Edited by mstark, 06 December 2012 - 04:06 AM.