Creative director Paul Sage told IGN that ZeniMax is planning to release the Craglorn update on Thursday or Friday.
The patch will introduce an "expansive adventure zone" to the MMO which, among other things, will feature 12-man trials.
Sage said Zenimax is still aiming to release fresh content for the game every four to six weeks. "We're either in the sixth week or the seventh with this update and I believe our next update is fairly on schedule.
"When we released we talked about our plans rather than 'this is exactly what it's going to be' - we're generally pretty careful about the language.
"I think any plan like that can be disrupted if something unforeseen happens. But right now we have the second update lined up and ready to go onto the public test server once we launch Craglorn, and that's coming soon. That'll be the Veteran Dungeon, Crypt of Hearts."
ZeniMax recently announced that Elder Scrolls Online subscribers will receive five days of free game time as thanks for sticking around during the game's rocky first month.
In early May, publisher Bethesda also confirmed that the console versions of the game have been delayed by six months. Xbox One and PS4 editions of the title were originally expected to be released in June, but have been pushed back to late 2014 to allow ZeniMax to "solve a series of unique problems specific to those platforms".