Just noticed UPS tracking says my SP4 was expedited and is scheduled for early delivery tomorrow (Mon), previously scheduled for Tues. Yeah!
Weird thing is I live in Seattle area, UPS tracking started by departing from Ontario, California bound for Louisville, KY. So my SP4 will have toured most of the country before it lands in Seattle later today!
I'm in Las Vegas at a conference now. My SP4 i5/16/512 arrived at the office 4 minutes before I landed at McCarran, of course.
Meantime, went to the Microsoft Store here on the north side of the strip and picked up an SP4 keyboard with fingerprint reader. Using it now on my SP3 and it is head and shoulders above the old keyboard in terms of key depth and separation, tactile response and the trackpad is substantially improved.