Square Enix held a livestream on March 18 to announce some of their new games across different platforms. While there aren't any new information specifically about War of the Visions, it came as a surprise to everyone that the Tomb Raider 25 year celebration included a collaboration with "Tom Clancy's Ghost Recon Breakpoint", and also War of the Visions.
You can check out the livestream through the link above, and go to the time stamp at 9:20 to view the announcement.
War of the Visions
It's only mentioned briefly that they plan on doing a "crossover" with WotV, so it's not really a confirmation that we will be getting her as a collab unit, but since Lara Croft is a unit in Final Fantasy Brave Exvius, having her as a unit in WotV is certainly possible.
We will be updating this page as soon as more information is available.
They will probably give us Classic Lara when we get the crossover cuz that look for her is more iconic and has been used in most of the promotional material for her 25th Anniversary.
i think the will only release a vision card as a part of collaboration just like what they did with FFCC and MFF collab, because it's cheaper to make and players are not very interested with the franchise.