OR MS is deliberately limiting the exposure to see how well this step does in the wild
That would imply that MS are somehow listening to feedback on the issues, and as of yet I've heard no official communications of any kind regarding the problems that they're aware of or what issues that this latest FW is supposed to address.
I guess there is a chance that they're lurking around on these forums, so in the remote chance that they are here's a little feedback:
1. Sleep issues appear to be addressed - system no longer spontaneously wakes up and drains battery, and have encountered no 'sleep of death' problems since the update.
2. Battery capacity issue has NOT been addressed - my 'maximum capacity' suddenly drops to 33,000 when on battery, and will show 100% capacity for hours when using battery after being fully charged - still have to perform the 'volume up & press power button' wakeup to reset the capacity.
3. Was very tempted to insert something rude here but thought better of it.