btw, I should probably let everyone know what "Watching" a Showcase Item does.
When you watch an individual showcase item:
Sends an alert/email when the Showcase Owner UPDATES the showcase item * Note 1
Sends an alert/email when a new REVIEW is submitted.
Sends an alert/email when a new COMMENT is submitted.
Note 1: This alert is sent when checking the "Post update to Thread" option. This will probably be changed to be its own permissions driven option by the time its released. This is to prevent sending alerts on each "save" when editing the item. The concept of the permissions based send alert option would be to give admins finer control on which user groups can send alerts on their items (spam/abuse control measures).
As with core XF, you can opt out of being emailed for each individual showcase item (exactly like the Resource Manager).
As with core XF, you can opt out of being sent alerts by going to the Alert Preferences and unchecking "Updates a watched showcase item", "Reviews a watched showcase item" or Comments on a watched showcase item".