Square Enix has stated previously that a new game is on the way.
In addition to the main character in "Tomb Raider: Lara Croft" there are only two very small female roles. To coincide with that, video game publisher Square Enix replaced the official "Tomb Raider" website with a vague circular logo and a promise that something more substantial will be there on March 15 at 6 a.m. PDT. We can safely assume that there'll be more Tomb Raider after that, though.
"We simply can't wait to take you on Lara Croft's defining adventure". This is by no means a confirmation, but considering that this release date is contained within the source code itself, it seems pretty likely that it's legit. It also states that the journey will begin with a "major event" in 2018.
At the time, it was assumed the game's reveal would occur around the debut of the new Tomb Raider film.
He also revealed in another Tweet that in the code he discovered that the game will not have ay kind of exclusivity as Rise of the Tomb Raider was a timed exclusive on Xbox One for a year. That date is April 27, 2018. The rest of the movie focuses on Lara solving puzzles to get further into the tomb she's raiding and fighting her way out of ruins that are collapsing around her.
"This is an origin story of Lara Croft for the big screen and we really wanted to focus on Lara and also the father-daughter relationship which I feel is the emotional core of this movie".
There's no playbook for how to make a movie "fun", but Tomb Raider is so wedded to its gritty mandate that it smothers out any variance in the personality.