A Twitter chat from early 2010 suggested Ner'zhul's story was not over:
Q. Will Ner'zhul appear at any point in 3.3 or the near future?
A. Well, he is a chunk of the Lich King now. But if you mean will he appear as an orc, we're not ready to tell his story just yet. We have a lot of stories left to tell, but his is a good one.[72]
On the official forums, CM Crygil made the following statement in response to a claim that Arthas "erased" Ner'zhul upon merging with him (at the end of The Frozen Throne):
He didn't actually erase the persona of Ner'zhul. In point of fact, these two beings merged to make up what was collectively known as "The Lich King".[73]
Subsequently, the following was stated by Chris Metzen at a BlizzCon 2010 lore panel:
Q. I have a question regarding the storyline of Ner'zhul: is he finished, or what's going on with that?
A. "Yes. Yeah, Ner'zhul is done. He served us well in that capacity, but really the Lich King idea... really has the ultimate expression, you know, as Arthas or whatever. Ner'zhul's done."[74]