well it seems now its still independent as "autodesk t-splines plug in for rhino" http://www.tsplines.com/products/tsplines-for-rhino.html

its going to be like ecotect. they buy it, sell it for a few years while striping it down for parts then discontinue it. i bet they bought t-splies for inventor fusion and revit. 

seeing plugin for rhino in autodesk store 8O 

http://store.autodesk.com/store/adskus/en_US/pd/productID.245375800