MS Launcher has upgrade our task card backend from Cortana cloud to task fabric in version 5.1, which user can see their reminders across Microsoft To-do, Outlook and Skype, and Cortana reminders is coming to task fabric and will be able to show back on MS Launcher task card in a future update.
Since MS Launcher version 5.2, English market users can retrieve the reminders (with date set) by connecting Cortana with Outlook services in Launcher Settings -> Cortana -> Connected Services -> Outlook.com. For non-English market users, the data remains in Cortana cloud and coming to Launcher Task card in a future update. In the meantime, user can always download the Cortana
app to see full list of To-Do items on Cortana cloud.