Quick update: I have a new favorite feature of Lollipop that I haven't seen get any attention in the tech press: when someone calls me, it doesn't take up the whole screen!! To be more accurate, it looks like if I already have the phone on and unlocked, the OS assumes that I'm in the middle of something, and that I might want the option of ignoring the intrusion of a phone call. So instead of taking over the entire screen, a box comes down from the top, only taking up about 10% or less. I then have the option of accepting or ignoring the call. If the phone is off when a call comes in, it takes up the whole screen as usual.