I've followed the days on which the scout list refreshes over the season.

As well as receiving a new scout list on the new day of the season for promoted teams (not sure about teams not promoted) The scout list refreshes on the following days:

3,4,9,13,17,21,25,28

If anyone has NOT been promoted this season can confirm if their existing scout list continues into next season or if its a brand new list. Thanks.

This has also been added to the Unofficial FAQ topic.