HEX alpha is certainly coming. Several fan sites had received 2 card pictures for exclusive spoiler on their site. Here are three so far, and I am sure HexVault will have one more near future, and HEXRealm has 2. One of which I reviewed myself and the post is ready to be published whenever the admin decides to.
*Updated: More cards are spoiled by couple other sites.
HEX Gamepedia Wiki