This probably won't be the last of the tablet videos from Mobile World Congress. I've noticed from past trade shows that most of the gadget blogs will still be posting videos a couple weeks from now.
The first video is by Charbax of ArmDevices.net, and it show an Android tablet from MSI.
The second video is an unboxing and initial hands on of the Witsech A81. It was posted by the retailer, Ownta.com. It's not a retailer that I'm familiar with.