Without further elaboration, Apple has started to tout the ability of users to connect to as-yet-unreleased new third-party gaming accessories as a feature of the iPhone OS 3.0 upgrade on its update page for the iPod touch.
Alongside an icon of a Dock Connector, the page states, “[c]onnect fun new game accessories via the iPod touch 30-pin connector and Bluetooth.” Apple has previously both announced and demonstrated support for third-party accessories connecting via both methods, but has not divulged an input standard for gaming or keyboard accessories.
Though companies could conceivably release joypads and keyboards without a standard in place, even including Guitar Hero- or Rock Band-style alternate input devices, the absence of such a standard could lead to numerous incompatible accessories that will only work with specific, limited applications.