See this blog post from Microsoft about the changes in TS CAL licensing.
In particular, they will now include the App-V for TS into the new Windows Server 2008 R2 RDS CAL! This doesn't get you an App-V for windows desktop CAL, which you would need for VDI. Price of the CAL will go up at the end of the year by 5%, but is discounted at old price until then.
More info in this blog:
And in this: