Though suspicious on its own merit, Apple's dev-kit exclusivity may not be the only reason the U.S. Department of Justice and the Federal Trade Commission have expressed interest. One of the criticisms lobbed at Apple as a result is that this decision forces Adobe's hand, potentially barring Flash from ever being released on iPhones or iPads.
Incidentally, the timing of this event comes very close to a personal statement by Apple's CEO which outlines the reasons behind the company's decision to ignore support for Flash. Originally, Steve Jobs' explanation seemed to appear without much provocation, but now we see how it may have been relevant. This statement may have been a move by Apple to publicly distance itself from Adobe and justify its refusal of Flash based upon sound business reasons instead of anti-competitive practices.
We should know in a few days whether or not the antitrust inquiry will become a full scale investigation. What are your thoughts on Apple's decision to require Mac-only development tools?