For existing characters? Not much other than the work is done and life can continue as regular. Portals are now able to be accessed so for those who need to send messages back home/make visits/etc they should now be able to do that. For those people who need the portals to remain closed as an 'excuse' to stay, please feel free to say your particular portal is malfunctioning
For new characters? This means they will arrive the way they used to do, the portal won't spit them out any which where, they'll have arrived in the portal room and been met by somebody who would explain the place - as usual feel free to have your character have paid as little or much attention to their orientation depending on narrative preference.