3 years later and no XSI on OSX. I doubt it will ever be released, which is a shame. The major problem, as I see it, is that Way back when MSFT owned Softimage they forced the engineers to to write the forthcoming XSI application in a MSFT specific object oriented coding language...which as screwed up as it sounds MSFT doesn't even support anymore. I think they dropped it in support of developing the as yet named .net/C#.
Anyway, the Softimage engineers should re-write the application just for that reason (no support/development of the language by it's own creators) and were they independent they probably would have done the same thing SideFX did. However, with AutoDesk owning Softimage and being cheap a complete ground up rewrite with no added features that AD can promote the Hell out out seems highly unlikely at least any time soon. I'm pretty sure AutoDesk eventually wants to have Maya, Max and XSI running on the same core so they can cut down their development teams drastically and make larger profits, but they want to milk the end-users for as much as possible before biting the bullet if they ever do. Usually if a profit greedy company gets a feature mix that consumers seem to like in a product they tend to avoid/put off major long term changes, even ones that may help them in the long run for the quick profit. I am curious what the OP decided on at this point. Depending on what you are deciding to do it may be/have been advantageous to consider switching to combination of applications that have more varied pricing options like Cinema4D/Houdini/Silo3D.
