Google announced last week that the new AdWords interface, after years and years of testing and incremental rollouts is now available to all advertisers.
On Wednesday night, Google said "starting today, the new AdWords experience is available to all advertisers."
We've covered the new AdWords interface dozens of times, so there is not much for me to add, outside of that it is now available for all advertisers.
There is not set time for when Google will sunset the old AdWords interface.
Forum discussion at Google+.