well, even though I`m Maya user I always liked XSI being Maya`s competitor but also inspiration. As XSI would be under Maya selling company, I`m not sure how this competition would work in future: http://usa.autodesk.com/adsk/servlet/item?id=12022457&siteID=123112
Autodesk states, they want to preserve XSI product line:
Petit commented: “As we have demonstrated since the acquisition of Alias in 2006, we’re committed to giving our customers choice when it comes to their 3D tools. We plan to maintain and grow the Softimage product line, and through Autodesk FBX provide better interoperability between Softimage products, 3ds Max and Autodesk Maya.
Definitely technologies will merge once again and data exchange between the two packages could be better with new versions of FBX. Welcome to the club XSI users! :-P
I have to admit that before Alias was aquired by Autodesk, Maya was missing proper modeling tools and major updates of animation tools. Waiting for this was endless, but under Autodesk these tools got much improved.