The optical lens elements:

• 18 elements in 13 groups (1 UED, 2ED)

• Maximum aperture: f/2.8
• Minim aperture: f/22
• 7 rounded diaphragm blades
• Minimum focus: 0.85m
• Filter diameter: 58mm (doesn't rotate)
• Power OIS; AF Linear Stepper Motor
• Lens length: 10cm (internal zoom and focus)
• Lens weight: 360g

An image of another Panasonic f/2.8-constant-zoom taken with the 35-100mm at 100mm f/2.8:

Other reviews:

• http://www.dpreview.com/previews/panasonic-lumix-g-x-35-100-2-8-ois/
• http://www.photographyblog.com/reviews/panasonic_lumix_g_x_vario_35_100mm_f2_8_asph_review/

The 150mm f/2.8 will be on sale next year