MaxtoA has been updated to 22.214.171.124, giving support to the new Arnold 7.2.3. This new version adds support to Global light samplint on the GPU. You will see a big improvement if you work with more than 8 lights in your scene. With speed increases that go from 2 times faster, up to 50 times faster with thousands of lights.
Distance shader now exposes direction and distance to nearest hit. Lee Griggs display in 3dsmax some cool examples:
With a voiceover tutorial over maya one:
Theres more improvements, check them out on the release note.