UPDATE (02/21): Looks like this was too good to be true. Turns out the images are actually of a fake webOS. TamsPalm reports that the the Centro is running is actually running TealOS, which only "emulates the webOS look and feel on all recent Palm OS devices". The software costs $15 from TealPoint Software. A video of the software in action can be found here.
Just today, TamsPalm was sent images by "an industry source" of a Centro, with the three images apparently showing it using the webOS operating system. Is this just a fancy theme or are they really working on bringing the next-gen OS to an earlier device?