DOS2 is made with the same Editor (with improvement) that EE was made off. That means that it support controlers and everything. It also means that if Swen feels like doing DOS2 for consoles, all the structure will already be in place.
Swen told everyone that he'll wait to see if EE is doing good and see after.
You should have a read at this in fact:
http://www.gamasutra.com/view/news/259483/A_PC_game_for_consoles_Remaking_Divinity_Original_Sin.php
