Still doesn't beat the pen tool. Good for a starting place. What I think is more impressive is the new upsampling algorithm in the image size.
"preserve details 2.0" It came out in the October release.
If you start with a "good" image you can go up like ten times in one step.
I took a raw file from my Nikon (.NEF) and was amazed at how Photoshop took it from 4000 pixels to 40,000 pixels.
We print ten feet wide, so resolution issues come up frequently.
See attached...note rulers