So RTM is due... Now basically.
Looks like they're doing something new. It's not ready for RTM. There's still some big holes in the preview. Dark theme isn't implemented everywhere, settings still isn't fully transferred over, Edge isn't ready, And a few other things.
Wonder if update on said date and devices released a month later or so. Or perhaps they'll put a kind of preview on devices and will need a substantial update as soon as you get home.
And big question on surface pro 4 terrible release date in regards to that. With skylark out in September. So either they realise a broadwell one for w10 release and be a year behind on CPU. Or release surface two months after w10.
Personally I hope they wait for skylake.