Why would they not add this changes as a patch, because if the game wasn't designed to look for patches it can't.
And these changes aren't that big of a deal...patches are so easy to do in PC games because you install part of the game on the hard drive usually, and the games are designed to look towards the hard drive to work.
Anyway, I recently thought I lost my Wii Sports disk so I bought a replacement part from Nintendo for $25.00 with shipping. I received the newest version of Wii Sports available.
It has the image with the Wii remotes in the plastic grip sleeves.
I haven't noticed any other changes like that, but I may have to do an experiment, because I found my old version, so I have both now. It would be interesting to see if they have made some of the games play better now.