Will be interesting to see where WePay goes. Group payments is a small category. Tickets and stores are pretty crowded. The bank relationship could be a helper or a hindrance.
Compare to Square which is flying with one brilliant idea.
I'd guess subscription management would be next.
From my phone conversation with Wepay's saleforce, they are moving away from "group pay" and focusing on the "business space" created by the "hate of Paypall".