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Currently I haven't found any app for the wp8. Also the mobile ui doesn't seem to work on my Lumia 820. It shows the main page but if I navigate to any device specific page (light/sensor/devices) I don't see my device there.

There is no special app for Windows Phone 8 yet. As for the mobile app, it is a simple web page, but it was not tested with Internet Explorer used in WP8. We will try to have a look on WP8 in future.

Hopefully you could soon get the mobile version to work with WP8 (or the Internet Explorer that it uses).
Currently it looks like my only option is to buy the Vera or change my new WP8 phone, out of which the Vera is the cheaper option.

Damn WP8 for not having an option to switch the browser.

In jqmobile/js/mobile_zwave.js:
// to workaround problem with jQuery mobile initialization when accessed by URL with hash (#allsensors, happens after reload)
if (document.baseURI != document.URL) {
document.location.href = document.baseURI;
return;
}
document.BaseURI will always be undefined in IE.

A more robust way could be
var iHash = document.URL.indexOf('#');
if(iHash != -1) {
document.location.href = document.URL.substr(0,iHash);
return;
}