Sony Mobile removed the “Close all” button for recent apps when it first released Android Lollipop, to the annoyance of some. Well it appears that Sony developers are listening as the button has reappeared in select Lollipop builds for the Xperia Z2 series that started to roll earlier this week. This particular feature is not available across all regions, for those where it is live, you may also notice the re-introduction of the NFC icon in the status bar.
Thanks Aaron and SO Andrew!