An interview about Dota 2 monetization was released by Gabe Newell to [Gamasutra][1] at the end of August.

> "The primary focus for us at this point is not worrying about
> monetization, and it's instead worrying about getting the game right,"
> he explained.

> "Our focus is really much on building something that's cool, and then
> we'll worry about monetization. So we're not going to worry about that
> until later. Premature monetization is the root of all evil," he said.

> When asked whether he believed being aware of your monetization design
> was important during the game design period, Newell responded, "I
> think not sucking is way more of an important thing to pay attention
> to first."

> "I think every gamer can point to shipping too early, or sucking, as
> being a way more dominant story in our industry than, 'Oh, it was
> slightly cumbersome to give the company money.' I mean look at
> Minecraft, right? Notch wasn't thinking through his incredibly precise
> monetization strategy."

Nothing has been changed during these months and at this moment is still uncertain what business model Dota 2 will follow when released. 





  [1]: http://www.gamasutra.com/view/news/36825/Newell_Premature_Monetization_Is_The_Root_Of_All_Evil.php