Sony announced two "new" E-mount lenses for NEX systems today: the 20mm f/2.8 pancake, and the PZ18-200mm f/3.5-6.3 OSS. The latter lens had already been shipping with some video cameras, but now is available separately (thus my use of the quotes around "new").
The 20mm pancake is said to be better quality than the 16mm, and a better match for the high megapixel count cameras we're now getting. It will list for US$350 and be available in April.
I've added data pages for the new lenses (20mm, PZ18-200mm).