As of the latest update, higher end PCs are now free to expand to the cast limit to 50 characters in the ring at the same time! That was always indirectly possible via the "Surprise Intervals" match format, but now it's officially possible before your eyes. I could push it even further, but it's the concept of wrestling itself that could not cope with more! That's something to look forward to if other free-roaming adventures come to the platform, which is looking more likely if this game's "Very Positive" first month can be sustained.
This update also contains a handful of other developments that can be better digested towards the end of the manual:
http://mdickie.com/guides/wempire.pdf