John Gruber, for Daring Fireball:

This “Marzipan” rumor got a lot of people excited. But Gurman’s report is so light on technical details that the excitement is based mostly on what developers hope it could mean, not what’s actually been reported. The less specific the rumor, the easier it is to project your own wishes upon it. And, oddly perhaps, we haven’t seen any additional rumors or details about this project in the four months since Gurman’s original report.

I’ve heard a few things, from first- and second-hand sources. Mostly second-hand, to be honest, but they’re all consistent with each other.

Firstly, the details John posted shed more light on iOS and macOS in the coming years.

Secondly, since this is in regard to Gurman’s “Marzipan” leak, Mark isn’t as credible as he once was:

Gurman doesn’t mention that the meeting was leaked to Gurman himself — the person who leaked this story was caught and fired.