Microsoft Test Manager "Recommended Test" feature not working with TFS Build 2015 (vnext)

Question

I'm trying to use the feature "Recommended Test" from Test Manager but the list is always empty.

I did the following:

• I have run the tests on a previous build and testImpact.xml is attached for each test
• I have changed the code so that 1 of the 2 must should be recommended.
• I assign the new build (with the change) and check recommended test against the previous build : the list is empty.

I know that Team Build vNext is missing Features but "Test Impact Analysis is not in the published list :

With VSO and TFS 2015 we introduced a new version of Team Build that has some great new capabilities, however, we didn’t have time to finish all of the features to bring it to parity with our Xaml build system. These include, label sources, associate work items and gated builds for Tfvc. Over the next few months we’ll be delivering these on VSO and then in TFS.

Source: http://blogs.msdn.com/b/visualstudioalm/archive/2015/08/27/ci-experience-futures.aspx?CommentPosted=true#commentmessage

Anyone have successfully use Test Impact Analysis with Team Build 2015 (vNext)