I wonder what the limits of a "pancake"'lens are. Could they make a 14mm or 85mm pancake?
Since Pentax can make a 70mm f2.4 Pancake and a really small 15mm f4.0 for APS-C, I think it is not completely impossible but the Limiteds are a bit pricy unlike the EF40.
Wait till they include diffractive optics into the mix
5D3, 5D2, Sony α6000, S90 | SY14 f/2.8, Ʃ20 f/1.8, 24 f/2.8, 35 f/2, Ʃ35 f/1.4A, 50 f/1.8 I, Ʃ50 f/1.4 EX, 100L Macro, 17-40L, 24-105L, 70-200 f/2.8L IS II, 1.4x II, 70-300L, 100-400L | E-mount: SY12 f/2, Ʃ19 & 30 f/2.8 EX DN, 16-70 ZA OSS, 55-210 OSS, Metabones SB | FT-QL, AE-1P | FD(n) & FL lenses