For example, the beta version we took for a spin was only compatible with the Xbox 360, but the final product is set to play nice with the PS3, PC and Wii U, in addition to next-gen consoles via a software update.
Of course, with next-gen sounding online connectivity, Bungie's silence on next-gen consoles is little more than a temporary vow -- Destiny seems a lock for (at very least) Sony and Microsoft's next consoles, if not also the PC(Wii U's looking unlikely).