One of the latest Sony patents disclosed a new kind of sensor. Pixel size does change based on their color characteristic. This does make sense because every color has a different sensivity. Read the google english translation:

• Patent publication number 2010-129548
  • 2010/06/10 Release date 2010/06/10
  • 2008/11/25 Filing Date November 25, 2008
• Current Issues
  • The signal level is smaller and more pixelated, S / N ratio is difficult to ensure
  • RGB wavelengths the energy profile for each file is different
    • Color imbalance
• Patent Technology
  • Energy profiles corresponding to the active area (pixel size) and
  • Long wavelength light (Red) is a large photodiode (detector sensors) and
    • Silicon on the substrate, R is the weakest of the irradiation energy
    • RGbGrB square fit to
• Consider the type and surface radiation exposure type back
• Bayer employs
• Pixel pitch of 1.1μm (back radiation) 2.5μm and (irradiated surface) examined

Source: Egami

According to photorumors.com “First we will see APS-C mirrorless lenses for Sony NEX and Samsung NX. Tamron is designing 2 compact zoom and one macro:

* Compact standard zoom: 24-50mm f/3.5-5.6 VR
* Compact telezoom: 75-200mm f/4.5-6.3 VR
* Macro: 90mm f/3.5 VR”

We can’t confirm the rumor now.