what dont you get about them? why they have mini track ends rather than dropouts?

cervelo is big on aerodynamics. in order to get the rear wheel as close to the seat tube as possible, they need the track ends. they certainly could get by with vertical dropouts, but then everyone would have to use the same size/model of tire, basically.

if they design the length of the stays to give 2mm clearance with 700x20s, if you decide to switch to 700x25 the tires may rub. alternatively, if they design for 2mm clearance with 700x25s, you'll have a much larger gap if you switch to 700x20. the track ends let you position the wheel as close as possible regardless of tire size.

the p2t model (their track frame) uses a 120mm spacing.