Last week I purchased TH2 for $130.00! I found out that it's included in the new version of Sonar, which I've received no information about in my email.
 
Not happy at all :-( Waste of money I really could have used for other things. Would have been nice to have received a newsletter or something that there was an upgrade imminent and what it contained.
 
EDIT: Just found out X4 isn't available yet, and Clint told me below that its not the FULL version of TH2. I'm happy again. Rant over :-D
 

Your not getting the full version with Sonar. You didn't waste your money.

Thanks Clint!
 
I'm also seeing that its not actually available yet. I feel better haha.

The "lite" version of TH2 was included in previous versions of SONAR as well. For starters, the full version has a lot more effects. 
 
BTW not sure if you're into bass, but the parallel processing is great for bass effects.