There's now little detail beyond that, but the Tweet says they're taking "new approach" here, and it "won't be very long between the official reveal and when you can play". Of course, just because Square Enix is playing coy doesn't mean we don't have some insight about the title. What if the first letter of the first word in each sentence combined to form a word? We presume this will be Shadow of the Tomb Raider, though Square Enix has yet to confirm its official title.
Square Enix is excited to share some big news with you next year. I also find it amusing that a message telling fans that they'll have to wait ends with, "we simply can't wait".
The Tweet that was sent from the official Tomb Raider account posted the following statement regarding a new Tomb Raider game.