As previously reported, there has been some chatter in the forums speculating that Google may have launched another Penguin update. That's not the first time this has happened since the original one, and it will surely not be the last, but rest assured, there has only been one Penguin update so far.
A Google spokesperson tells WebProNews: "There hasn't been an update since the first one."
It doesn't get any clearer than that.
Of course, one Googler recently said that Google didn't even have anything called Penguin, so I guess you can never be 100% sure.
That said, I'm pretty confident that this particular Googler is right. Even the speculation about the possible update has been mixed. Some are attributing traffic dips to the holiday weekend.
There's also the fact that Google makes changes every day. We should soon be seeing the big list for the month of May.
In the meantime, you'd probably do well to focus on making your site and content as good as they can be, and keep it all within Google's quality guidelines. Also, try to make sure if you hire an agency to do your SEO, that they're not engaging in any paid linking on your behalf.
You can still expect Penguin to be coming back around sooner or later.