The Authipay gateway has now been released: http://dev.pathtoenlightenment.net/shop/authipay-gateway-for-woocommerce-1-62-0/. Should you have any questions about it, please feel free to ask.
I developed a WooCommerce extension that allows displaying prices and receiving payments in multiple currencies, and it also allows to switch to a specific Currency based on visitors' IP address. Basically, the first time a visitor comes to the site, the currency is switched to the one used in the Country he connects from (if available). From that moment on, that will be the currency he will see on the site, unless he manually selects another one.
The plugin is not available on WooThemes because I was told that they don't take any more submissions, but it can be found on my website: http://dev.pathtoenlightenment.net/shop/currency-switcher-woocommerce/