Just dug up this info on one of the web sites.
Tick vs Season 2
For some reason they are also dropping an episode from this collection. The First volume was missing "Tick vs the Mole Men" which was a forgettable episode. This time around however it's rather more serious as it's "Alone Together" which was the episode with the Galacticus parody character and was generally very funny.
I do however have a theory as to why they are dropping an episode from the first two season collections. Both seasons were 13 episodes and the third season is only 10. So I have a suspicion that the third season collection will have the two "missing" episodes. Since that will give you 12 episodes in all the sets.
Tick vs Season 2
For some reason they are also dropping an episode from this collection. The First volume was missing "Tick vs the Mole Men" which was a forgettable episode. This time around however it's rather more serious as it's "Alone Together" which was the episode with the Galacticus parody character and was generally very funny.
I do however have a theory as to why they are dropping an episode from the first two season collections. Both seasons were 13 episodes and the third season is only 10. So I have a suspicion that the third season collection will have the two "missing" episodes. Since that will give you 12 episodes in all the sets.