Ok, this was BIG news on the other sites I am part of, and I am kinda suprised I couldn't even find a mention of it here. On the iTunes release of "The Last Roundup" Derpy's voice was changed, the by-name reference by Rainbow Dash was removed, and her eyes were "De-Derped." This has caused a huge commotion around a lot of places.
I was going to post a video of it, but apparently I cannot, so you are gonna have to look it up for yourselves if you haven't seen it yet.
BTW, if this is old news here, just go ahead and delete this. I just couldn't find anything on it anywhere here.