Adding strips with Shift+A drops them where your mouse is, and can be moved right away. This is enabled by default using the Move Strips property in the operator. (PR#138382)
Preference setting to use pre-4.2 strip handle tweaking ("Tweak Handles") was removed. (PR#140031)
"Prefetch Frames" was moved from VSE preview area settings into VSE timeline settings
Cache tab, and is now on by default. (PR#139635)
New footer region with playback and frame range controls. (35bcbad7e9)