Adding a term like "superpower" and "first world"/"third world"/"developing" does not mean much. 50, 60 years ago even before China had this preeminent superpower status, China still did what it wanted without too much concern of international status, and recent events do not stand contrary. The combustible combination of arrogance/pride/belligerence has always been there with China, hence, I see little real change occurring, although the solidifying of new western and eastern blocs may be interesting.
On a slightly different perspective, the transformations within China itself will be interesting. Infiltration of more democratic ideals perhaps?
One aspect in my mind that has always epitomised superpowers is their ability to attract significant migration, and we will see in the coming years whether or not this occurs with China, and the potential consequences.
Personally, any migration to/from China will be a good thing, as the sort of veil the Chinese have constructed can be better penetrated, and a glimpse offered at the Chinese people. People (non-Chinese) often discuss "China" but fail to remember that they are really discussing the CCP, which does not necessarily reflect the attitudes of the people. Migration plus better democratic ideals will not only help in penetrating the veil but may also start a greater say that the people have in their government's actions, and may help curb some of the perceived combative stance the CCP often portrays to other nations.