The destruction of the hubs is certainly painful. There are many people who're currently struggling with battery drain issues, that's probably going to be fixed though. There's no agenda view in the calendar.
This has been driving me insane. I loved cross posting to Facebook and Twitter from the People hub. The application that brings that back will earn my money.
The prospect of paying for something I used to get for free is kind of infuriating though.
Remember, this is the developer preview release. The intent behind removing those from the People hub, IIRC, was that the Twitter and Facebook apps can integrate into the Hub themselves with new APIs. By the time Windows Phone 8.1 hits general availability, Facebook and Twitter app updates may restore the functionality.
I've not got a Windows Phone myself, but from all the reviews I've read the functionality is neutered somewhat, even after the applications have reintegrated themselves.
The destruction of the hubs is certainly painful. There are many people who're currently struggling with battery drain issues, that's probably going to be fixed though. There's no agenda view in the calendar.