My SP2 has the dot light.
Prior to the latest update the light always stayed on if connected to the SP2 and plugged in.
I noticed the light was off this morning after being connected overnight. I then disconnected and reconnected the tablet end of the charging cable.
Light (dot) came on as soon as the cable reconnected but went out a short while later. Battery charge indicated 100%
This is how I arrived at the idea the update may cut off charging when the battery reached 100%.
Anyone else experiencing this?