If you haven't came across this yet, this is very interesting! Lara Croft can be seen in this "Ready Player One" SDCC Teaser Trailer! A lot of characters are going to be in this film, but it came as a total surprise to see LC herself! You can see her at about the 1:50 mark towards the right of the screen talking to Master Chief amidst the race cars!
It was also surprising to see this and absolutely nothing about the upcoming Tomb Raider film. I was expecting at least a teaser or a panel since it was presumed Alicia Vikander was in the immediate area. I guess they have other plans for us and we'll just have to wait and see.