With the release of the newly integrated Melodyne Tempo Detector, will we be able to use this to stretch audio to a specific, constant tempo. I followed the steps in the E-zine, to have the clip follow a constant clip tempo, after having processed the tempo map. The project then followed the constant tempo that I picked, but it didn't seem to do anything to the audio. I currently have Melodyne Assistant. Would I need to upgrade in order to be able to stretch the audio to a specific tempo? 

I follow the instructional video, i.e. drag a clip into the time ruler but nothing happens. Time ruler does not turn blue and the cursor just turns into a white crossed circle. It does not matter if I drag the original clip or with Melodyne Region FX applied.
(Sonar Platinum, latest update.)

See this post. Also ensure that you have the VST3 version of Melodyne 4 installed.

For some reason after I installed update from CCC, Sonar was still Newburyport and I did not notice that. So I installed it again and now it works.
(And first time I saw it in action it left me speechless). 

I have not yet looked at the E-zine, but the standard way to change a variable tempo to a fixed on after mapping the timeline would be to enable Audiosnap 'Follow Project' in Autostretch mode on all clips, and then delete all but the initial tempo. If audio did not follow the tempo change due to removing tempo map entries, then Autostretch was not properly enabled. You can do this ether using the Audiosnap palette or the Audiosnap options section of the Clip tab in the Inspector before changing/deleting any tempos.