No, MindMixer uses the same language across all sites and cannot be changed.
To create a "Coming Soon" topic, navigate to your Management Dashboard, click the Topics tab as shown below.
The orange "Create New Topic" button will navigate you to create your new topic. Towards the end of the page, as shown below, the section "Coming Soon" will have a box you can check in which in the administrative view, will show this topic coming soon. This will display a preview of the topic two weeks before the start date.
For further strategic direction as to which topics to publish on what date, your Customer Development team member can assist you.