About Aero Bright Coating, you can read this on pentax.jp website :
[Main Features of smc PENTAX-DA55mmF1.4 SDM Lens]
...
A newly developed Aero Bright Coating enhances image-description performance by effectively reducing reflections over a wider wavelength range. Compared to conventional multi-coatings, this new coating greatly improves light transmittance in the lens, while drastically reducing flare and ghost images that deteriorate image quality.
...
here is the link
http://www.pentax.jp/english/news/2008/200818.html
Also, during the photo Paris show (salon de la photo de Paris ) the presentation of the 55mm DA* was beside a 3 lenses block where there wasone lens without coating, one with traditional coating and one with the last Aero Bright. And it really different.