Improvements to the store are indicated by the eShop team.
The Nintendo eShop will not be available just before the system update hits according to a news bite on the European version of the store. It also mentions that new features will be available once the update is performed and players return to the eShop.
The message reads:
On account of the upcoming system update, which will be available by 8 December, Nintendo eShop will be unavailable for a limited period while the main server undergoes essential maintenance.Read more...