Humans could evolve into two distinct species...

"HUMANS could evolve into two sub-species within 100,000 years as social divisions produce a genetic underclass.
The mating preferences of the rich, highly educated and well-nourished could ultimately drive their separation into a genetically distinct group that no longer interbreeds with less fortunate human beings, according to British scientist Oliver Curry. The rest would be shorter and stockier, with asymmetric features and lower intelligence.
Dr Curry also said that the current concept of race would be gone by the year 3000, as relationships between people with different skin colours produce a "coffee-colour" across all populations."

Read more at http://www.timesonline.co.uk/article/0,,2-2406821,00.html