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This subject is entirely out of my specialty. But read this report for yourself about an obscure Chinese mathematician in the US who just proved an important theorem in number theory

http://simonsfoundation.org/features/science-news/unheralded-mathematician-bridges-the-prime-gap/

By the way, the report is also a model of popular science writing and of making an obscure subject accessible to the general scientific public.

Finally here is a Chinese report of the same.

UNH数学家张益唐证明世纪难题——孪生素数有无穷多个

I also want to thank Prof. Ruixi Yuan (formerly of Tsinghua) and others for bringing this to my attention.

Note added 5/27/2013 A deeper but still accessible explanation of this discovery can be found at http://mobile.slate.com/articles/health_and_science/do_the_math/2013/05/yitang_zhang_twin_primes_conjecture_a_huge_discovery_about_prime_numbers.html