Well, I guess during the PC->console porting phase more things took place than the reimplementation of Shale. Or this is the elusive Montreal studio at work. Seems like they've got their timetable pretty well perfected (apart from the limping of Return to Ostagar, but the plan's good, if not the execution)...
Interesting, wonder how they are going about this? Using the the auto save that reverts the game to just before the final battle?
Probably that, or whatever save you've created afterwards for playing DLC. That's the way they've announced importing is going to work from ME2 to ME3, and if they know THAT in this phase, they've probably prototyped it somewhere else to 'great success'.