Board Thread:Online Discussion/@comment-89.168.202.237-20150713152737/@comment-1600847-20150713152944

You can visit them.

Without spoiling the story, once you complete the Main Quest and hit Veteran Rank 1 (Level 50), you have the option of playing through the other 2 alliances with your character. So you'll be able to see Morrowind and Skyrim in the Ebonheart Pact zones.