Advanced Photo System type-C is an image sensor format approximately equivalent in size to the Advanced Photo System film negative in its C format, of 25.1×16.7 mm, an aspect ratio of 3:2 and Ø 30.15 mm field diameter. From Wikipedia
Sales begin September 4 with UK prices set at £519 for 12mm, £2,999 for 200mm, US/Australia pricing pending.