Fujifilm has announced a strange new lens over in Japan. It’s called the XM-FL, and it’s a 24mm f/8 body cap-style pancake lens that features built-in photo filters that can be accessed by turning a dial on the side.
Very light, totally “dumb” (ie no electronics), for ~$100, can make for interesting experiments on your Fuji X.
From Fujifilm Japan (in Japanese)
Similar in principle to the Olympus body cap lens in 2013.