Princess Rika

She isn't apparently. He got all his fighting traits from his father, but it's been hinted at that Goku got his gentle side from his mother and it was realized when he smashed his head on Earth.

Well, Toriyama already gave a little back story about their relationship. Her name is "Gine" (I guess it's a pun off the word "onion") and her back story is that she was apart of Bardock's crew, but Bardock had to keep saving her and that's how the relationship started. She wasn't fit as a warrior, so she was given the job of preparing meat. That's all the details he gave during the interview.

I guess that's the translation for his name. I'm not entirely sure though. Yeah, I prefer dub for almost of the anime I watch. It's a bit weird, but I can't have a solid opinion on Japanese voice acting, because I'm not fluent in the tongue. I know you don't have to be, but it's just my preference. I do know about certain elements such as SSJG, Videl being pregnant with Pan, and the whole concept of the gods. I guess Toriyama wants Vegeta to possibly be the star in the next film (whenever Toei decides to start production) and wants to reveal Goku's mother in a manga special of some sorts. Kinda like Episode of Bardock.

No, I haven't yet. ): I'm still waiting on Funi to dub the film whenever they get the rights from Toei. Though I have seen the OVAs released over the years like "The Return of Son Goku and his Friends" and "Episode of Bardock". :) I do know about Bills though (his official English name is Beerus).