In the near future, your place in life, indeed the very opportunities available to you, are determined by your genetic profile at birth. Or, as Ethan Hawkes' character Vincent, a "de-gene-erate", puts it -- and here I paraphrase -- "We don't need class or race to discriminate anymore. Now, we have science." However, there are still loopholes for those clever, desperate, and determined enough to follow their dreams to crawl through.
I believe this is the most deliberately paced movie I've ever watched. And that's appropriate, for it is a meditation on every theme it touches. Consider this key line of dialog: You want to know how I got this far? I never saved anything for the swim back.