Well, we may have been right. The Last Roundup was recently reuploaded, with Derpy's name no longer being mentioned, and with a more generic, girlish voice. (Derpy's voice actress originally thought Derpy was a boy, so her original voice was deeper.) There is also evidence of her eyes being "underped" or at least not as derped as they used to be.
Words can't express how much this disappoints me. Derpy has always been shown as well meaning and hard working, just clumsy, or for a lack of better term, derpy. Her behavior, her eyes, nothing about her is offensive. If anything, her cheery disposition and can do attitude despite her clumsiness should be celebrated.
See for yourself, this is the edited opening to The Last Roundup, with her new voice, and "underped" eyes.
I encourage everypony who loved Derpy just as she was to visit http://www.savederpy.com and let our voices be heard. At the same time, I ask everypony to be respectful in their response. Name calling, hate and bile will not help, and will cast a negative light on the brony community. We can express our displeasure intelligently and peacefully. Thank you all for your time, Im going to go watch my Full Derp copy of The Last Roundup Now.