I am using qTranslate to show different pages based on language settings. It uses a similar way as Polyglot.
In the posts (both pages or articles) fields contain:
[lang_en]some content in english[/lang_en][lang_nl]some content in dutch[/lang_nl].
All-in-one-seo-pack however takes the whole part into account and therefore generates similar meta's for both languages. It would be really nice if this would be supported in the future.