I don't think it's possible, sadly. At least not without the editor. I'm not entirely sure how things have changed, whether many items have new names in the code, the file structures are fundamentally different, or what. A cursory glances suggests it's not THAT different, but at the very least things like map keys and item names might be different.
Conceivably you could go through all the item/characters lsbs (or rather, .lsx versions of the lsbs) and find any differences between the original and the EE and manually update any changes there. Update old stat files with the new EE ones. And once the editor comes out, you'll probably be able to recompile the story code. But some things like terrain data might be hard or impossible to transfer to the EE, which is a bummer since terrain is rather important and hard/impossible to recreate.
If it's possible, it's probably going to be a pain.
Last edited by Baardvark; 30/01/16 11:31 PM.