Great looking concept. Well done!
I really hope we see a 1530 this Spring. MS has to know that they need to compete strongly in the phablet area, particularly now with iPhone going that route, and the well established Note series. If they are going to be about productivity, and use that as a selling point, their next phablet iteration needs to be impressive. I like my 1520 a great deal, and I look forward to seeing what MS comes up with for the next go around. If they went for something similar to your direction, I would not be disappointed.