I know I will sail on Epic. I am interested in the new design. Except the "pop up camper" that is the Garden Villa Suites. That is really ugly.
I like the renderings I've seen of the new cabins, venues and I like the expansion of the specialty restaurants. I know it is a way to get more revenue but I do like the concept they now have on the current ships and I enjoy dining in different venues on different nights.
I am unsure about Oasis. I will probably sail her in a couple of years just for the experience and I can't really give a valid opinion until I actually sail her. It may be sooner since my wife was impressed with what she saw on Good Morning America.