Mechanicaly self leveling loaders are available on Australian, UK, and Europian market Bransons. I don't know if they're available in the US. Dave's Tractors and other US Branson dealers should know the answer to this question.
Branson is coming out with an option of self leveling loaders. All I can tell you. Will be available next year. I for one do not like self leveling,. I feel I don't have control of the loader and I want control of it at all times.