Level Synch confirmed...(?)

[Davorok]

+ A lot of quest content will appear in A Realm Reborn, and a feature they’re implementing is “level sync” which will allow you to lower your level to match a friend’s so that you can experience the same content together and feel like you’re making progress experience-wise.

Sorry if this is old news but was new to me. Here is link to article.

[Shougun]

Confirmed. It will be present in entering some instances as well.