Unity and LEGO contract?

Whats does Unity-and-LEGO contract have to offer. I heard that UNITY strikes multi-year contract with LEGO, but it doesn’t say why. Will LEGO give the Asset store its LEGO pieces, game mechanics, or what?

Unity has some deals with Lego, so Lego is licensing Unity to create content. This is not really relevant for other developers in any way, though - basically it just means that Lego is one more customer of Unity.