Well, I got Studio 4, but something's frustrating me: I played and sang a song into Studio 4 with no click and varied the tempo as I played even more freely than normal, just to see how good Melodyne's new tempo detection really is.
 
The tempo detection worked just great - really impressive, in fact. You can watch the correct measures going by in Melodyne, with beat one falling exactly right every time, despite my deliberate expressive timing fluctuations.
 
The trouble is, I can't figure out how make Sonar recognize the analyzed tempo so that I can now add loops, etc. and have them follow Melodyne (and not Sonar). I can't seem to find a setting telling Sonar to follow Melodyne's tempo.
 
Would anyone know the way to accomplish this?
Thanks in advance!
LJ

Me too! This is a key feature

At the moment, the timing information detected by Melodyne can be directly transferred into DAW only in Presonus Studio One. Indeed, this key feature should be added into Sonar immediately. Otherwise, Cakewalk is lagging behind.

I hope this is not true, valsolim (not that I doubt your sincerity, just that I'm hoping you are mistaken)! I bought Melodyne 4 Studio solely because of this great new feature. I already had Melodyne Editor 2, and I would not have upgraded for any other reason.
 
If it is true, their advertising is very seriously misleading and I will be very disappointed and upset. 

I have just sent an email to Celemony asking about this.
 

I haven't upgraded yet. Can export to midi be a workaround? Can it preserve the tempo? 

Acron, that's what I tried to do yesterday, but I couldn't figure out how to make that work, either. That doesn't mean that it doesn't work, just that I can't figure out how to do it.
 
I'm still hoping that someone here will come up with a solution that a) works and b) I can understand and implement

Acron
I haven't upgraded yet. Can export to midi be a workaround? Can it preserve the tempo? 

Yes export to Midi from the stand alone program works. You then have to start a new project in Sonar and open the midi file so it will set the tempo map. Do not import the midi file, use file open.
Brian

skinnybones lampshade
I would not have upgraded for any other reason.

Of course, we all have our own priorities and needs.  For me, the ability to so easily manipulate the timbre of the instrument (by varying the strength of the various overtones) is surprisingly powerful.  This feature directly controls what we have tried to accomplish with EQ, exciters or other methods in the past.
 
I ran a bass recording into the thing last night.  The overtone package was mostly as I expected, but there were several overtones that were not at all what I expected to hear.  Being able to take them out or emphasize them is really revealing.  I am now interested to try this on several different basses to see how their timbre varies.  This might help some people make equipment choices, even if they don't use this feature in their mixing.
 

skinnybones lampshade
I hope this is not true, valsolim (not that I doubt your sincerity, just that I'm hoping you are mistaken)! I bought Melodyne 4 Studio solely because of this great new feature. I already had Melodyne Editor 2, and I would not have upgraded for any other reason.
 
If it is true, their advertising is very seriously misleading and I will be very disappointed and upset. 
 
I have just sent an email to Celemony asking about this.

It's great that you have asked Celemony! Please, keep us posted about their response. I also hope that the direct transfer of the tempo progression will be available in the next update of Sonar. However, according to my knowledge, Sonar Lexington does not support this feature.