German site MobileGeeks has published a photo and spec sheet of the Samsung Galaxy S III Mini which is due to be unveiled tomorrow.

Rumours about the device were very optimistic, predicting power to rival its bigger brother – but the specifications posted by MobileGeeks are very much mid-range.

Instead of the Exynos quad-core processor of the S III, the Mini will contain a lowly 1 GHz dual-core ST Ericsson U8420 CPU and the WVGA screen was barely high-end 2 years ago.

We’ll have to wait for the official announcement tomorrow, but those hoping that Samsung would have a device to truly compete with the iPhone 5 at the 4″ size look like they will be let down as the trend for top specs at big sizes continues.