A dpreview forum member posted pictures of the three upcoming Sony NEX lenses: 50mm f/1.8, 24mm f/1.8 and 55-210mm f/4.5-6.3. Those lenses were shown as prototypes before and were listed on Sony NEX roadmap for 2011. Announcement date is August 24th (Nikon will also have a major press event on that date).
Here is a size comparison of all Sony NEX lenses from Talknex forum:
