The Elder Scrolls Online is built to accommodate both single players and groups, according to a Q&A blog on the games official site.
The blog says that there will be locations that are better to explore solo, or tough areas that may need teamwork, but are generally free to be tackled either way. The developers said, “The Elder Scrolls Online is set up to be a fluid experience. As you wander the landscape you’ll encounter caves, forts, tombs, dungeons, and etc. Certain rare locales will just be for solo players, and some dungeons are meant for groups made only of people you choose to go in with. Most locales, however, will be accessible by everyone.”
The game seems to be catering for those who are new to MMOs by saying that there will be clear distinctions between standard dungeons and those that are meant to be tackled by a group. It was also confirmed that each dungeon would have a Wayshrine where you could be revived if your team mates couldn’t assist you so that, “You will never be forced to leave your party because you died.”
The sign up for the beta test is still open on the official game site.