[bhartzer]

Looks to me like it was purchased initially in 2006, which was before IDNA2008. It currently expires in 2016, and I would suspect that it would be tough to renew that domain when it comes up for renewal, because + (the plus sign) is not allowed in the .com TLD.

[e28eta]

I'm not familiar with domain name rules, but it sounds to me like Google has ~5 years to lobby to get the rules changed, or to make +.com so ubiquitous that refusing renewal would be a worse idea than permitting it.