TeamViewer is a very popular tool for remote access due to its ease of use and firewall bypassing capability. It is widely used by IT support, sysadmins, appliance manufacturer, Pos system makers, individuals etc. If this hack is real it would have huge ramifications for users of this tool.
Remote-control tool wobbles offline, blames bad passwords for compromises
Source: TeamViewer denies hack after PCs hijacked, PayPal accounts drained
Update (2016-06-04): Also reported here.