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Good choice, and likewise I haven't been able to nail down a release date, but from what I can see it makes an excellent HTPC setup...
All Athlon X2 BE models will be replaced/renamed 4x50e and two additional models will be launched; 6250 and 6050. These are based on the much anticipated Kuma core.
I don't know, unless I'm missing something, OCUK don't seem to stock any of the BE models at the moment.