Grey's Anatomy Season 5 - info?

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I was surprised to find that Grey's Anatomy - Season 5 has been released in Mexico, considering it was delayed/cancelled in the US. Does anyone own this, or have any info on the release?

I looked at some Mexican DVD online stores, and saw the cover art, but that's about all I could find. Do the discs have English lossless audio, and would they be easy to navigate for someone who only speaks English? I myself don't have problems with releases with a lot of foreign text (I have a larger number of Japanese, French, German, and Dutch releases and have figured out how to navigate them), but this particular title is one I'd be purchasing for my girlfriend as a gift and as such am interested in how easy it would be for her to use.

Thanks for any info you can provide!