We learn a few things from this statement, namely that Apple has been already asked for comments on the spy chips, and has hinted towards an earlier, much more benign incident. Bloomberg's piece is titled "The Big Hack" for a good reason, as it involves microchips planted in servers destined for big US companies, which stealthily hooked to the networks their carrier hardware was hooked to. More than 30 victims are reported, including juggernauts like Amazon's Web Services, and Apple.
Since China assembles the bulk of the phones and computers globally, it has been fairly easy to mandate installing a certain microchip for various government purposes. The company that supplied the servers, called Super Micro, is one of the largest such assemblers, and several US national security sources claim it has been infiltrated by officials from the People's Liberation Army (read: the military intelligence).
Needless to say, all involved, including Beijing, deny the allegations, cry wolf, and say the facts are either misrepresented or non-existent, but the fallout is yet to be felt completely. Apple, in its turn, is positive nothing malicious has been taking place, and no customer data has been compromised by an alleged hardware hack: