10% more stylus input into the OS (Wish it was more, but Joe did spill the beans that people would most likely be seeing more stylus input features put into cheap windows 10 in the near future. I am awaiting redstone)

Interactive live tiles (not here yet, but announced at build 2015 this year it's still coming. Waiting for redstone)

Toggles pane within the action center (feels like charmsbar 2.0 for me originating from windows 8.1 Pro)

Multiple apps snappable both in landscape AND PORTRAIT orientation (yes finally; Does still some refinements though)

Drag and drops of files between desktop and windows buy software online is possible (not much, but getting there; needs more refining on the touch UI department which more apps implement this. Would be a great and natural interaction between apps when utilizing like a tablet)

I love it that they still support hotcorner/swipe gesture to spread out hidden title and app bars in ported apps with swipe down from top edge. At least by doing this office 2013 professional is still usable with the core apps from the "first" windows store.

Still determining why I'd desire to use is on my surface pro. But for multitasking its practical virtues. Adds a more recent layer of flexibility of mulitasking (does needs more refinement though)