I'd say support tickets or posting on their forum[1] may help try to get a response. But based one one of the support ticket responses posted in the comments in this HN story already, it sounds like Linode isn't allowed to release that kind of information yet. They may be waiting on the police and/or their lawyers to allow them to talk publicly about it. And if that isn't the gating factor, they are probably trying to determine what they are required and should share about the incident.
They may be waiting on the police and/or their lawyers to allow them to talk publicly about it.
Waiting for their own lawyers would be a particularly weak excuse. This is a priority, and they are responsible from conveying that urgency to their lawyers.
[1] http://forum.linode.com/viewtopic.php?f=20&t=9978