Hmmmmm I personnally do not care about PvP, they include it, good, they do not, ok not a big deal.
But I see an interesting problem, this is a turn based tactical RPG which mean you have to wait that your opponent chose his actions while it his turn to play... anyone see the problem?! What if one of the opponents decide not to play? A timer for chosing your action should then be made I think, except if someone find another solution^^
And 1 vs 1 seems more interesting to me than a sevrals opponent versus : it will be long and you will have time to take 2-3 cofees before your turn to play come again