I got one today! Here are the scans of the cover art:
About the back cover - the Polish description is in fact a cheap backpaper GLUED to the Steelbook. It looks really ugly. REALLY bad printing quality. However, after removing the backpaper (which requires a hairdryer or water to remove the paper and WD-40 to remove the glue) there is an ALL ENGLISH back cover. You can see the real back cover on the scan below. Please note that my copy still has some glue left on it (the big shade on the right and lower part) cause I didn't use the WD40 yet - I wanted to provide you with the scans as soon as possible
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The funny thing is that the BD specs on the real back cover are the same as on the glued backpaper. Why the **** did the distributor glue it (eventhough they were shrinkwrapped together, so no difference actually), is beyond my comprehension.
To sum up - Polish
Gladiator Steelbook is the ONLY white version of the movie with all-English covers.
Group buy thread:
https://forum.blu-ray.com/showthread.php?t=116650