Actually, they've already said that the tech this game is being designed from the ground up to be able to work with tablets/mobile.
http://forums.cryptozoic.com/showthread.php?t=23180
First post, near the bottom.
To be perfectly honest, i'm not sure where the "overly complicated" part is coming from. Sure, you've got the people that are gonna comb through all their cards and find overpowered and broken combos and the like, but you'll get that with anything, Hearthstone included. The PvE aspect seems super casual friendly as well, with the matches all using save states, so you can just drop and come back when you want. I was looking forward to Hearthstone until i found Hex, now i'm very excited for the beta to start in september.