If you want to try out the game early, fix a few bugs, and voice an early opinion you are in luck. If you head on over to the official PlayStation site you can input your PlayStation login and sign up for the beta to PlayStation All-Stars. The beta will be in September and last about a week, but it will be the only chance you get to play the game before it releases in November.
There are no details on what the beta will include (such as characters or levels) but it should be interesting to try out. Note that it seems to be for the EU, but it can’t hurt to get your email in their system to show some interest elsewhere right? right? PS Plus members will also most likely be seeing the beta come their way as well, so stick around for more details!