Arca-Swiss has announced the p0 knobless tripod head featuring the patented Monoball Planetary P system. There are currently two P system tripod heads: the p0 designed for use by photographers looking for precision equipment at an affordable price; and the p1, a tripod head with a wider diameter that is capable of handling the greater demands of heavy telephoto lenses or even 8x10” large-format cameras. The p0 is available from €175+VAT.
Update: The maximum payload of the p0 is 20kg according to photoscala.