Sorry for taking so long to reply! If you watch Wii U footage which is currently operating on what will be the patch 1.0.4 equivalent of the 3DS version, her Luma timer is 13 seconds, up from 8. (You can count the seconds yourself at the beginning of this video:
https://www.youtube.com/watch?v=yjVF05k0El0)
The patch is not out yet, so no other buffs/nerfs are known until people pick up on something else from the Wii U footage or until the patch comes out. Hopefully Nintendo will make things easy and supply us with patch notes. (Although, Wii U footage has shown Bowserciding now ends in a tie -
https://www.youtube.com/watch?v=noAQvTdONC8).
The replays vanishing is definitely proof that buffs and nerfs are coming though. The way that the replay feature works records button input rather than video, so any change to any aspect of character's abilities will desync the replays from how they actually happened - which is why they get deleted.