The pricing for this is $19.99 / £17.99. This is valid until April 2nd. It will then revert to the full price of $49.99 / £44.99.
No official announcement was made for this but tonight is the Square Enix Presents showcase may change that.
The description for the bundle is
Tomb Raider: Definitive Survivor Trilogy is the complete edition of the award-winning Tomb Raider origin games. This collection contains all the definitive edition content from each critically acclaimed prequel title—Tomb Raider: Definitive Edition, Rise of the Tomb Raider: 20 Year Celebration, and Shadow of the Tomb Raider: Definitive Edition. Follow Lara on her formative journey across the world, starting in Tomb Raider trapped on the shrouded island of Yamatai off the coast of Japan, to the harsh Siberian tundra hiding an immortal secret in Rise of the Tomb Raider, and finally to the mountainous landscape of Peru to uncover a cataclysmic power in Shadow of the Tomb Raider. With all the definitive edition content from each game, this Trilogy promises dozens of hours of breathtaking exploration, challenging puzzle-solving, and survival combat with Lara as she becomes the Tomb Raider she was destined to become.
So we get all 3 games in the prequel trilogy which are
2013 release Tomb Raider.
2015 release of Rise of the Tomb Raider
2018 release of Shadow of the Tomb Raider.
As well as the base games, the collection includes access to all content such as all DLC and Season Pass entitlements.