Chipworks is quick to announce the reverse engineering report of Sony 12MP 1.75um BSI sensor for camcorder, part number IMX061. The company also quotes Sony saying it is likely to start applying a BSI technology on their CMOS sensors for 5MP camcorders or digital cameras with 1.75um CMOS pixel technology. The IMX061 die size is 8.93mm x 7.93mm:
Thanks to R.F. for sending me the info.