Everything coming out is heavy on the multiversal aspect of the D&D line. The Forgotten Realms is only one of the settings, and it seems most people think it's been played out. They're not going to have new editions anymore, that also means not rebooting FR every time they need to retcon something, but instead just making another plane for the new content to come from.
As for why they might be avoiding the "non-western" areas of FR, let me look through my copy of Oriental Adventures to get some insight.
