I think we are getting a bit carried away here with the Tyros 2 sounds.
1. Yes the Mediastation now has available sampled sounds of the Tyros 2
2. No the Wersi Does not have the Tyros 2 sound set
The Tyros 2 (Like a lot of TOTL Yamahas) has Megavoices in its styles which are special recorded samples, (They cannot be replaced with normal samples in any format (This is why a lot of Tyros 2 styles don’t convert correctly) and what Wersi has done, is written its own software to emulate exactly how the Yamaha system works (As it is their own software code, they have therefore not infringed any of Yamahas Intellectual Property) including the Megavoices.
POINT TO NOTE in all their sales literature when Yamaha is mentioned, there is always an asterix (Or other indication) after the name, which if you go to the bottom of the page always acknowledges that Yamaha is the Trademark of the Yamaha Corporation. (The same applies when VST and Akai is mentioned in the sales literature)
I hope this clarifies matters regarding the Direct Play of Yamaha Styles.
As to Direct Play of other manufactures styles, it takes a great deal of time and effort for the development team to write the software to emulate another instrument, and so while they may be added in the future, it will take time.

Bill