The rumour was true. Today Square Enix announced Tomb Raider: A Survivor is Born via GameInformer - along with a picture of the new young Lara Croft.
The announcement includes this description of the title premise: "After a brutal storm destroys the boat she was travelling on, a frightened young woman is left washed ashore on an unknown beach. On her own but not alone she has only one goal, to survive." Breaking down the brief description, the story begins with Lara croft surviving a maritime tragedy - sounds like a great start for a platform adventure title.
Crystal Dynamics staffer Darrell Gallagher teased some possible game changes. "Forget everything you knew about Tomb Raider, we are exploring things that have never been done before in this game." Gallagher points out that this is, "an origins story that creates Lara Croft and takes her on a character defining journey like no other." It may or may not be a Tomb Raider as we know it - the announcement didn't give many official details. Given it tells of her origins it's fair to expect she will be earning skills as the story begins.