I've had the chance to play around with the Note 10.1, that's the tablet with the S Pen. The reason they've delayed the release is that they've changed it dramatically since the preview at the MWC. It now has a 1.4GHz quadcore processor (I think it's the Exynos on the SIII), a 5 MP camera (instead of the 3.15) and the back got a hyperglazed finish just as the SIII. I've had the pebble blue one and I'm not sure if there is a marble white one.
The S Pen is much bigger than the Note 5.3 (looks EXACTLY the same), but smaller than the model shown at the MWC and it now fits inside a vertical hole in the lower left side. An amazing software feature is the Photoshop Touch app which is brilliant (as you may see in my video).
Here are my videos:
Short hands on presentation: http://www.youtube.com/watch?v=eueOIjW5cIo
S Pen and Photoshop Touch review: http://www.youtube.com/watch?v=J0b0SRT_D74
It's an astonishing device, clearly stepping way higher in the high end line and it works like a charm. If you have questions feel free to ask, but unfortunately I no longer have it to do extra demos.