Indeed, they extended the license at the same time they bought back the rights to interactive version of their more popular games (Monopoly, etc). Hasbro was likely using the D&D rights as a bargaining chip to get back the interactive rights on the properties they are focused on.For those of you with a short memory, you might not recall that Hasbro sold the D&D electronic rights to Atari (Infogrammes) some time ago. Last year those rights were extended to 2017 with the press release saying (in part):
"the extension until 2017 of the exploitation of the intellectual property rights to the Dungeons & Dragons universe, under an exclusive license covering all interactive formats, including online and wireless."
So they simply can't "pull the license back" as some of you suggest.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.