From what I know, many of the pack-in "embedded" games are games that people made for the GP2X (mostly freely available) that are being updated for the Wiz. In some cases, I think this update is going to be fairly professional. In other cases, I don't expect much. I also think that there will be some professionally made Flash games running on the Wiz, but I don't know if they will be included in the embedded games.
For more on the embedded games check here.
http://www.gp2xwiz.co.kr/FrontStore/iMakePage.phtml?iPageId=105
I think there will be lots of emulators on this system.
I also think that they have plans for actual commercial games. I don't know if they will be "physical" games or released on some sort of downoadable app store.
I did a post about some of the upcoming commercial games for the Wiz.
It's here.