The new Wraith Prism HSF is exclusively bundled with the 2700X, the other models feature the Wraith Spire or Wraith Stealth coolers.
According to internal benchmarks from AMD, the Ryzen 7 2700X is about 7.7 percent slower on average in video games than the Intel Core i7-8700K flagship. In comparison with the Ryzen 7 1800X, you can expect about 5 percent higher performance from the 2700X.
There are also some slides about the new 400-series chipsets. One new feature here is Precision Boost Overdrive, another intelligently-controlled performance feature that promises to crank up the maximum Boost frequencies even higher than XFR2. You can check more slides at VideoCardz.