It is not available yet, but we are working on it as (just after) we speak. Not all features will be availble directly though, be most will be.
Is there an update on the status of the general availability of the Sprintr tree grid? Can we expect this to be available in 3.2?
The recently released TreeView is the publication of a simpified and stabilized branch of the sprintr tree grid (the sprintr tree grid is very tailored towards sprintr itself). If you are missing certain features, please file feature requests at support.mendix.com.