Another possibility is that Apple will introduce the budget-priced Apple iPhone 5C and wants to introduce it in the region to show those who cannot afford a full-priced iPhone, that there is a variant of the device that could fit their budget.
If Apple can get it's iconic smartphone onto China Mobile's lineup, it could be a big deal, considering that the carrier has more than 1 billion subscribers. If Apple can convert 10% of those subscribers, that would be 100 million units which would add up to some serious dough for Apple.
As for when we might see the Apple iPhone 5S and Apple iPhone 5C launched in China, we recently passed along a report from China's First Financial Daily that said that the pair will be released in the country on November 28th. That is nearly 2 months after the expected September 20th launch of the devices in the states.
source: Sina.com.cn (translated) via TheRegister