There is no indication currently [February 2018] that Pixar is interested in a Cars 4.
When asked, director Brian Fee said ...
I don't know. I'm not sure. I actually don't know the future of the franchise. I don't know where we'll go after that. I don't know if we'll make one. If we do, will it be more McQueen? This is the third act but I don't know how many acts he has in his life. Will other characters be main characters, at this point I have no idea. I think anything's possible.
Wheel of Fortune - 1983 Fast Cars Week 4 18-4 was released on: USA: 7 September 2000
Chasing Classic Cars - 2008 Rolls Vs- Rolls 4-12 was released on: USA: 13 December 2011
Ace of Cakes - 2006 Police Cars and Wine Bars 4-9 was released on: USA: 20 March 2008 Hungary: 21 November 2012
There is no Cars 3 scheduled for release at this time. However, Cars 2 is scheduled for release on June 24, 2011.
Great Cars - 2003 Classic Cars was released on: USA: 20 June 2005
Josexito02 - 2007 Cars 4-6 was released on: USA: 10 April 2010
Wheel of Fortune - 1983 Hot Cars 4 20-4 was released on: USA: 5 September 2002
Chasing Classic Cars - 2008 Porsh-Ahhh 4-4 was released on: USA: 11 October 2011
Wheel of Fortune - 1983 Fast Cars Week 4 18-4 was released on: USA: 7 September 2000
How Do They Do It - 2006 Rally Cars Neon Signs Biggest Ships 4-4 was released on: USA: 11 April 2007
Top Gear USA - 2010 America's Biggest Cars 4-4 was released on: USA: 24 September 2013
Counting Cars - 2012 Pimp My Bus 3-4 was released on: USA: 14 January 2014
Chasing Classic Cars - 2008 Kuwait 4-8 was released on: USA: 15 November 2011
Chasing Classic Cars - 2008 Packards 6-4 was released on: USA: 21 May 2013
Great Cars - 2003 Exotic Autos was released on: USA: 4 April 2005
The Car Chasers - 2013 Lights Cameras Cars 1-4 was released on: USA: 26 March 2013
Cars-TV - 2009 Concorso Italiano 1 9-4 was released on: USA: 17 October 2011