I have the i7/8gb/256gb configuration, I purchased in mid-December shortly after the i7 model came out, also have the type cover and dock. After a few days of owning the SP4 and reading the forums I enabled hibernate on the power menu and pretty much decided
that was the way to go as it simply wouldn't wake from sleep reliably. After the 2/17 update, I re-enabled connected standby (and also tried disconnected standby) and still had the same issues waking up and went back to hibernating. And of course I verified
the update(s) were applied correctly (which they were). Very disappointing - especially after seeing reports on different sites claiming the issue was resolved once and for all.
A few days later I decided to perform a complete wipe and reload using the latest SP4 Win10 Pro image from MS as well as the latest .msi driver file to apply immediately after re-imaging (though by the time I was up and running the cumulative and 2/17 updates
were already downloading in the background). I did disable bitlocker and reset the TPM before wiping the system. It was certainly a hassle having to reload everything but I haven't had a single issue since - it's been 6 weeks of everything working as expected
(even with the type cover attached 95% of the time). My SP4 no longer sucks down the battery as badly (I typically see 7+ hours on battery and I use Google Chrome with flash disabled), runs cool on battery and wakes reliably. I'm using disconnected standby
(Wi-Fi option unchecked for battery in power & sleep settings) with the default of transitioning to hibernate after 2 hours.
Not sure if it's luck OR if there's something going on with the factory image/config? Re-imaging may be worth a try. Granted, no one should have to go through this, especially with a brand new system, but it may work - it did on mine.