@SamGan
swiping apps to the multitasking screen. the swiping is new. the n900 (the only other comparative device in this instance) had you push the minimise icon. instant and less movement than the swipe gesture. while having a minimized apps screen is also not new, only the swipe action is. swiping is fun though, its very responsive.
after much playing around with multitasking apps, there feels a 'need' to be able to make the multitask screen full size to swipe to an open app or have a way to get immediately to the multitasking apps screen. currently the two swipe gestures is inefficient and can become irritating. and the animated transition from touching a multitasking app to it sliding on is more of a gimmick not aimed at response time.

the peek 'feature' only lets you see the multitasking screen or the apps screen. and this is partial and shadowed. the only plus i have found for peeking is when apps are full screen i can peek to see the time and wifi status.
oh yes, the big advertising hype of peeking while watching a video. oh the power it wields. a gimmick. the video cannot be played while multitasking in the background. so what do you peek at?
i use the swipe to 'peek' feature on the n900 to view a desktop i have with some realtime detalis on it.

i judge the ui on efficiency of movement, distance travelled. one hand holding is not the best with the ugly back arrow at the bottom, and save/cancel all the way at the top. these need to be worked into a gesture somehow. holding it in one hand and gesturing with the other is more efficient although you travel the entire screen regularly.