Interact, yes. Execute AJAX? Not so much. Matt Cutts said in April: "So Asynchronous Javascript is a little bit more complicated, and that’s maybe further down the road, but the common case is Javascript."

From the short article, it seems like this is going a bit further than what Cutts is saying GoogleBot is capable.

That specific video came out in April, but we actually taped the video a few months earlier. Google continues to work on better/smarter ways to crawl websites, including getting better at executing JavaScript to discover content.