I know I'm triple dipping for sure.
I first got the regular DVD and then bought an HD-DVD player later and then picked up the HD-DVD. I felt the TrueHD audio track was good but I know it could be better. So I'm definitely triple dipping for the Uncompressed PCM track.
Since they already announced the features on the Blu-Ray release, I guess that can confirm that there's no TF2 teaser.