Oh social media, you can be such a fickle mistress.

Once again the line between customer information and spoiled surprises has been blurred, this time by Porsche Centre Brisbane asking on Instagram for expressions of interest for the 2018 Porsche Cayman GT4 RS 4.0 - though the post has since been removed.

A grand gesture for those who might like to drop a deposit, except there is no Cayman GT4 RS 4.0. At least, not officially.

News of a potential mid-ship tarmac weapon started circulating earlier this year, with rumours suggesting the GT4 RS would be powered by a version of the 368kW/460Nm 4.0-litre flat-six in the bigger-brother GT3 RS.

Given the 283kW/420Nm 3.8-litre Cayman GT4 is currently about 80kg lighter than the GT3 RS, it would be presumed the GT4 engine will be down on power, so as not to show up the 911 GT flagship.