I need to get some advice before installing the preview !!! i have installed the previous previews but they were not efficient so i had to rollback to 8.1
IF you are not sure you want to try it, then it is not for you yet. Wait till final build.
IF you are a brave soul willing to take on the adventure and expect the unexpected, and understand that this is not the final build and is a work in progress, then you should do it ASAP