After seeing WebEx release an app for WP8 today, I thought about one of it's rivals which my company (and many others) use, Citrix's GoToMeeting. So I asked them if one was in the works. Here was the response:
https://twitter.com/GoToMeeting/status/407591503356104704
https://twitter.com/GoToMeeting/status/407591503356104704