Their quote is a little bit out of context. From the original it doesn't look like Werner Herzog is interested at all.

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Okay. Last question. Keanu Reeves wants you to direct Bill & Ted 3. Any comment?

Werner Herzog: I don't understand that question, acoustically. Can you please repeat?

Keanu Reeves. He wants you to direct Bill & Ted. Is that something you would ever consider doing?

Werner Herzog: Who is that? Who...is...that!

Keanu Reeves is an American actor...

Werner Herzog: Oh. Keanu Reeves! Sorry. I do not understand you acoustically. This Keanu Reeves says what?

He wants you to direct his time travel comedy. A sequel to Bill & Ted's Excellent Adventure.

Werner Herzog: I have not seen the first and the second. So I do not know. But, if it is a good screenplay, I am ready for all sorts of wild stuff.

Does comedy and time travel appeal to you as a director?

Werner Herzog: I have not seen these films. I cannot really comment.

EDIT - link to interview : http://www.movieweb.com/news/exclusive-werner-herzog-talks-into-the-abyss-a-tale-of-death-a-tale-of-life