MX650 FW or Palo

We are looking to replace our MX450 with something with more bandwith and curious if we should look to Palo or if the new MX650 will become a firewall anytime soon?

Edit: I forgot to mention the MX450 is around 6-7yrs old, and honesly surprized Meraki has done nothing with the higher end line. Even a short term bump with a MX455 and bumping the specs would have been something I would have expected.