New
#920
I doubt it very much. I'm only aware of two previous occasions when the ISO for the MCT was updated. 1607 got an updated ISO half way through its long life, and 1803 go a new one a few months in when some initial bugs had been removed (much like 1809, but on a far less dramatic scale - just some insider settings left in by mistake).
But ddelo's upgrade was via windows update, which would have checked for the latest update in the process of upgrading. An upgrade using the MCT's ISO also checks for updates by default, so it doesn't really matter what ISO the MCT makes. I would be very surprised if MS have suddenly changed their approach and start updating the MCT ISO for each month's new build.