I’m in the market for buying a new retina MacBook Pro and was thinking of the top spec 13" model
Will the iris graphics be sufficient for Rhino?
That depends entirely on your definition of “sufficient”.
Yes, Rhino will certainly run on it but I think that model only has the embedded Intel HD graphics chip on it. It works in OSX but it has sacrificed graphics speed for battery life.
If application performance is more important to you than battery life, then I’d suggest one of the larger hybrid models that has a second high-performance AMD or Nvidia graphics chip.