If you use the beta for xbox can you still be in the PC beta?
Preorders are per platform only, but remember that they only give you a couple of days earlier access to the beta test, after that anyone and everyone can join in regardless of if they preordered or not.
So for example you preordered the Xbox version, you could play the Xbox beta a couple of days earlier, then in late August you can play the PC beta when it's opened to everyone.
The Xbox beta start date for preorders is on July 19th, but everyone can join in on the 21st.
The PC beta is slated for 'late August' - we haven't got a date yet.