Twitter is becoming the mother of all press releases, since big company officials seem to prefer tweeting to announcing products directly. After Andy Rubin and his Google-related announcements on Twitter, it’s the turn of Bill Cox, responsible with Communications for Windows Phone to promise us a “juicy surprise” for tomorrow.

Microsoft will announce some software releases for WP7, including Angry Birds, Kik and GoWalla, but the surprise is something else entirely. Cox might refer to the Mango Beta ROM release for developers or maybe the availability of Mango developer smartphones. The latter will please us greatly, since there’s bound to be a leak of pictures, if this happens.

If we’re lucky enough, we might even get to see the very first Nokia Windows Phone Mango unit… I guess we’ll have to wait till June 30th to know.

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