Yes. DCL has changed the BG numbers for those taking the DCL bus. You can now get a later BG number. You will have to wait until your BG is called to board the ship.
Typically, no. Once the boarding number being announced catches up with the number being issued at the check in counter Open Boarding is announced. Anyone holding any boarding number may board. Generally this happens around 12:30-1:00
We added the transportation after we checked in and got our PAT. Our PAT got moved to much earlier. It took some time for it to change tho, don't remember the exact amount of time it took.
There is a difference between Port Arrival Time (PAT) and Boarding Group (BG).
PAT is the time you are allowed to enter the cruise terminal. It is typically selected during online check-in. However, people on Disney transportation from a Disney hotel will typically be assigned a PAT that matches the bus arrival time, so they can enter the terminal when they are dropped off.
BG indicates when you are allowed to board the ship. The boarding group number is related to the port arrival time in that people with an earlier PAT will usually have a lower BG number, but they are not directly connected. The first people to board, usually at or before 12 noon, have BG 1. The next number will be called every 3-7 minutes or so. As PrincessShmoo described, at some point DCL stops calling BG numbers and allows people to board as they arrive in the terminal.
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