Marty talked about some tweaks to Miiverse on the Wii U!
http://www.nintendoworldreport.com/news/36486
Players can now control both the Wii U and Nintendo 3DS versions of Miiverse in a similar fashion. Marty from Nintendo of Europe announced the news in a Miiverse update earlier today.
The button for reloading is no longer the L button, replaced by the Y button. Nintendo added a new feature related to when you have a community open. You can now quickly go from post to post by using L and R buttons, which allows for quicker scrolling.