Honestly? Not really...

I don't know where to look between the logo, tiles, sidebar filters, sign-up button, big text "tabs", forced uppercase, forced lowercase and that mysterious white pane at the bottom.

It all sort of makes sense and doesn't at the same time. It's a really hard one to explain. I think a first step you need to look at the typography. It's all over the place. If that's a Windows style convention, there's no saving the human race.

It's also not that useful to just have a massive tile-spread of things at the topmost levels. Keep editorial and design control over the first "Find apps" screen. Also make sure you're not suggesting things that people already have on those screens.

And why are there things without icons?

The new version looks really good. When will that be available?