As far as I know this has not been patched yet.
There is a very simple solution to monitoring this problem. Simply adding your own filter with an alternative email address. I just tested this and while the email is sent away from your inbox, it is sent to both addresses. This way you will atleast have a record, and if you check that address more regularly it will act as a notification system.
Obviously it is possible, since Google has responded to the threat and proof has been shown of domains being stolen, but nothing new has happened here. It is simply a clever implementation of a few common tricks.