Alright guys, if you don't know, the v1.5 beta for Rebellion has just been released. You can download it by going to your steam library, and right clicking on Rebellion. Next, you go to the beta tab once the window opens, and just select opt in.
Happy RT4x'ing! -MooMugger
EDIT- You do not have to enter a beta code (thanks for pointing that out Ares)