completely free of charge.
Of course, it's not entirely up to him, but Lombardi hopes to get at least some content -- like the upcoming map packs -- over to players at no additional charge. According to him, DLC isn't about earning increased return on games, but rather about "keeping the customer happy." He sees the work as being an investment in future projects, as it builds consumer trust with the Valve label.
No official date has been set for the first TF2 console DLC. Let's just hope that Valve's admirable philosophy wins out in the end.