After some work, I got the schematic of the new receiver revision ready. Or if not ready, then at least to a point, that I am quite happy with it. Check it out here.
The changes from the v2 schematic include obviously the 4051 multiplexer for the hardware PWM support, as well as the fact that all output connectors (servo, I2C and UART) are now on the single board. Also, I got rid of a lot of protection resistors, which I don't think were actually that relevant.