Kino Lorber have announced that they will be releasing The Blue Angel on blu-ray on 4 December. No word on whether this edition includes both the English and German versions (or extras, if any -- a running time of 124 minutes on a single disc is given by Amazon; this disc may well be Region A locked). It is available for preorder at amazon.com
Universum Film GmbH released the film on blu-ray in Europe (Region B, stated running time 107 minutes on German Amazon) on 31 August. Their version, according to a review on amazon.de, includes both the English and German versions, as well as the extras including Dietrich's screen test, interview and concert clips and a German commentary by Werner Sudendorf. According to Universum theirs is a two-disc edition.