I met with them a month ago and they thought it would be resolved within a matter of days. It's not yet, and I doubt whether the Scoopon boys are exactly quaking in their boots.
I know that would be the obvious plan, just saying it's not exactly in their control at the moment so it's anyone's guess really. If or when it's resolved sure they'll revert to Groupon.com.au. My personal opinion is that the Groupon brand is American and as huge as it is, it doesn't mean it will resonate with Aussies.
Deals would have been a good acquisition for them. If it were me (and obviously I'm biased) I would be using terms suited to each country/language as part of my strategy.