Two questions: 1) The Windows Creation Tool, does Microsoft update it to their newest version? 2) What is the newest version that they are using in the tool?
Are you sure that it's 1511? I used the Windows Creation Tool and then installed Windows on my computer. I am now running Windows Updates and there I see Cumulative Update for Windows 10 Version 1511 for x64-based Systems (kb3124262).
Ah so there is not a version that actually include the 1151 update already in it yet? Or, at least not one that Microsoft is publicly supporting via their Windows Creation Tool.
The 10586 iso IS the 1511 and as all windows versions before it will get updates, kb3124262 is the latest cumulative one released thru WU (till tomorrow 10.00 am redmond time).