As stated, the 100 or so dealerships was the original plan (prior to the lawsuit), but post lawsuit, Genesis had to (unfortunately) let every Hyundai dealership the opportunity to obtain a Genesis franchise, even if they weren't up to par when it came to customer service.
Under the updated scenario, it seems that there will be 100 or so built from the ground up, stand alone dealerships, but there will still be another 200 -250 dealerships either stand alone (but in existing structures - such as O'Gara) or sharing a lot with the Hyundai dealership, but having a separate showroom and customer lounge (this is for the smaller volume or not deep pocketed, small family dealerships).
Genesis has already been culling the franchises which didn't have the resources to even build out a shared lot store, so figure with additional culling, we'll ultimately end up with around 300 dealerships in total.
Note how the Hyundai dealership owned by the same dealer group which built the 1st ground up, stand alone store has gotten high ratings.
That has more to do re customer service at Genesis dealerships than any fancy new facilities, whether stand alone or on a shared lot.