In Foreign, Google Play has six sections: Apps, Games, Movies & TV, Music, Books, and Magazines. You can buy stuff if you plug in your credit card. From China, though, the only accessible sections are Apps and Games, and the only accessible content in those sections is whatever is downloadable for free. This is not entirely useless, but nearly.
Other Google stuff works though. Maps and translations and voice typing and data syncing and whatnot.