Over the weekend, Disney Imagineers took down the construction walls surrounding the second (original) Dumbo spinner.
It looks like the double-Dumbo and the interactive queue will be opening soon, as Disney has said. I suspect we may start to hear about guest testing and soft openings in the coming days and weeks.
Here is a different shot where you see the inactive spinner in the foreground with the new spinner running in the background. If I happen to still be at WDW when testing or soft openings occur, I'll try to get some shots and share them on the blog.