"So, there are 2 candidates, build 10400 or build 10800" I say there is no way it is 10800 - MS doesn't want 10 associated with 8 in any way, shape, or form.
Based on that magic number 16, the RTM would be 10800! Look at this calculation: Windows 7 : 7200 / 16 = 475 Windows 8 : 9600 / 16 = 575 windows 10 : 10800 / 16 = 675 Is that an coincident?
No cause Win7 RTM is 7600, Win8 RTM is 9200, Win 8.1 is 9600. Win8's RTM was really in the 85xx range but jumped to 9200 cause of the 8888 mistake. If no mistakes are made and no delays occur, it would be well in the 10400 range.
There's nothing magic in it, it's just another way of saying there's a difference of 1600 between the numbers.
I'm not realy a guy for guessing but more like we will see when we get there And for me RTM is not realy a mile stone as long as they keep the updates for windows coming in with bug fixes and "tweaks" to the OS
I took that only because those well educated users regarding the Activation Numbering were pointing many times to the Number 16 and 100 as multiplier! For me, as I said already, I didn't mind about any number which may would be chosen!