They did suggest returning to your Home World before the update in order to avoid congestion issues.

From the pre-launch announcement:

Additionally, characters that were visiting another World prior to Patch 7.0 will still be able to return to their Home World regardless of traveling restrictions, but their ability to return may be temporarily impeded by periods of server congestion. As such, if your character is currently visiting a World that will have traveling restrictions, we advise returning them to their Home World before Patch 7.0 maintenance begins, as the restrictions will lower your login priority.