Overall, I like what you've done. There are some parts of the interface that seem slightly too busy, but maybe that's just me - I opposed the new start screen too.
I remain skeptical on the usability of having so many different swipe gestures, and I think you built a bit too much redundancy into the changes (swipe left or right, swipe up or down, etc). I also think cramming everything into the task switcher is a questionable approach, I already feel the long press is annoying for task switching itself, let alone secondary functions in there.