Nintendo's North American website has revealed the next system update for the Switch will arrive on 18th September alongside the launch of the online service. After installing version 6.0.0, it will no longer be possible to unlink your Nintendo account from your Switch user account. This means you have until this date to unlink it. After this update is released, the eShop will go down for maintenance. Once this is complete, online memberships can be purchased.
At the end of August, hackers reportedly uncovered information about version 6.0.0. The findings revealed more user icons would be added. There were also controller icons located, suggesting new officially-licensed controllers could be on the way.