A previous post I read said that they will have their own buses. You might search for a post entitled "Pop Century is Far Out". I think that is where I read it.
I seriously doubt that they would share buses as Pop Century is no where near the All-Stars. If anything they would share with the CBR, as they are right next to each other. Just my opinion!
Pop Century will have it's own buses. Reason: DEMAND. Pop Century will have 2,880 rooms, and will average 75-80% even during slow times. So, even when it's slow, it'll be busy.
There is one possibility that is being talked about. When we open, Blizzard Beach will be sharing with DAK as it does with most other resorts. However, if we discover that this isn't working out, they might make Blizzard Beach its own dedicated bus, and have it share with Caribbean Beach.