You're right that would make sense. I'm guessing they somehow incorporate the West Bowl lift in order to do this since I believe there's less wiggle room along the east side of the ridge. And if I remember correctly, the bowl that tumbles down the summit on that end of the ridge is one of the best areas of the bowl. As for where the other lift would go, that's anyone's guess at this point, and is obviously an integral part of the development. There aren't any plans of this on paper that I'm aware of. As I mentioned I believe this is very new news since it's only started to be discussed no earlier than Warren Cook's arrival (this past fall). I'll be heading up there this weekend or next so I'll try to get more information on it as it becomes available.
It's still worth the trip even without the backside open. Here is a link to the trail map that includes the proposed plan, which has now been in place for a couple of years. From what I understand, the location of these proposed lifts are subject to change to a certain degree i.e. slightly different location, different length but they're all expected to be implemented to one degree or another
For example, from what I understand, there may be a new lift that's installed in between the proposed lift furthest to the East and the south Branch Quad. It would more than likely unload in between the proposed false peak lift and the Kennebego lift.
Sorry, here it is:
http://www.saddlebackmaine.com/html/trailmap.php