I'm not too worried about Marzipan in the short term, I'm thinking the goal of that project might be to get devs who make pro apps on the mac side work on a codebase that they could easily port over to the iPad side seen as the iPad Pro is seriously lacking in app support compared to the Mac, because it's unprofitable to maintain them.

In the long term this is a play to push Cook's iPad Pro post-pc idea, yet again...