If there is no mention of development activity on the wiki or forum, there is no reason to ask about that camera's status: It is not supported, and there is no way for anyone to know if or when it might be supported. A port of a new camera model happens if and only if there is a developer who has the camera and sufficient time, motivation and skill to complete the port.
If this describes you, then you may be able to help. You can also obtain a firmware dump of your camera to submit for future developers, and once a port is started, you may be able to help with testing.
If your camera model is supported, but your particular firmware version isn't, a developer is still needed although they may be able to do it without access to the camera. In rare cases, you may be able to update your cameras firmware to a supported version. How can I get the original firmware version number of my camera Finally, please do not volunteer as a tester hoping that will attract a developer to work on your camera.
If you are actually willing to spend hours and hours trying different builds of the CHDK software and live through crashes and reloads and partially working software, and then document in detail what you discover, the developers will welcome your help.
Official Canon firmware updates (if available) can be found here at the Canon website or in this list here.
Note: You cannot update your firmware from a CHDK "firmware dump". BIN files are only useful for CHDK development purposes - you cannot load them back onto a camera.
A620 Firmware : information about an unofficial upgrade of A620 firmware from an early version to version 1.00f can be found at this message.