Kind of surprising the UFC would throw this one together at the last minute as a preliminary bout. Both fighters sport some sick jiu-jitsu and it might even turn into a stand-up war. Whenever two guys are great at one particular area, there is always a chance it gets decided with blood. I'd drop the Stann/Soszynski fight to the undercard, if I was in charge. No way does that one deserve a PPV slot and especially not when you have something like this as an alternative.
I'd like to think the UFC is considering this, but I know how much they are on Stann's balls, so it would be a monumental shocker if it was changed.