http://inews.co.uk/culture/film/bill-and-ted-3-face-the-music-cast-release-date-trailer-keanu-reeves/

Bill and Ted 3: everything we know about ‘excellent’ new film, Face the
Music The film is due for release in Summer 2020
by Al Nelson
Tuesday March 26th 2019

Word of another Bill and Ted film is the excellent news we need right now,
and with stars Keanu Reeves and Alex Winter announcing the news last week.
Well, we say news — rumours of a third film were confirmed by Winter as
far back as 2016 — but either way, with concrete, definitive video
evidence of a threequel, it’s time to get excited. It’s going to be called
‘Bill and Ted Face the Music’, and here’s everything we know about it.

[...]

Winter said at 2011′s San Diego Comic-Con that the time travel element may
extend backwards as well — specifically to the prehistoric era — and the
film is likely to see a cameo by Eddie Van Halen, as well as the return of
Socrates and Billy the Kid, who appeared in the first movie.

[...]