Citel Video (France) just released remastered anamorphic, English Stereo DVDs of Asterix The Gaul, Asterix & Cleopatre, and 12 Tasks of Asterix.
I bought all three and I can confirm, all have excellent anamorphic video quality. The video is really crisp and the colors really pop. Maybe now I can appreciate the films better with better video quality. It's still the same funny English stereo audio, which I don't think is a big deal. No extras, No English subtitles, but they also have the original French stereo.
Here's the site where you can buy the three: