Not sure what you mean. I know that it works much the same as all other DLCs in that it comes through a radio broadcast and you have to travel to the Mojave Drive-in.
You are right about having to wait to get to the main menu now, it's really starting to get on my nerves, I actually made a thread about it a few days ago.
Another thing I noticed, Camp Forlorn Hope seems to have gotten a tiny face lift. Also, OWB seems to have made my game quite a bit more laggy, especially when fast traveling to the Big MT and when leaving the sink.