From the Poptropica Blog...

That evil Black Widow from Counterfeit island...

UPDATE: Another picture was found on the blog. It sounds like all of the villains of the Poptropica islands will be coming together, so we'll see what will happen... Here is the picture posted on August 22:

The evil Binary Bard from Astro-Knights island...

And yet another posted on August 22...

The evil Captain Crawfish from Skullduggery island...