Someone snapped a photo from an Asmodee solicitation. This looks to be another tournament kit to celebrate the Phoenix Clan Pack.

Two Tadaka Playmats
42 Extended Art Cards (Some will be for everybody. Some will be limited to top placed players.)
There's also speculation that the advertised extended-art Stronghold card MIGHT be acrylic as a 1st place prize. We've only seen extended art strongholds as acrylic cards.

YO FULL ART BIRDS!

Release date April 2018. It seems that the Clan Pack will be finally in March, then.

What are the full art card? I can't make them...

One seems Fushicho, the other is obviously the Stronghold, and the last one is a new one.

Also, AFAIK, every promotional poster uses the image of already existing cards, so that main picture must belong to one of the new cards.