We have finished the packages for the Raspberry Pi kernels and did some brief testing. Since we use very standard configs from the RasberryPi foundation we feel they should be pretty stable. They hit the repos just a few minutes ago so update and test away. If you run into any issues or bugs, please report them in the Manjaro-Arm bug tracker.
I plan on getting some requested packages into the repos soon that will help with the gpio development that the raspi is capable of. If you have other package suggestions, please use the forums to describe what it is and why it should be included.