This is offer looks too good to be true. Even if you are just after either the lens or the camera alone, selling the other one would offset you quite a bit of the costs. Bundle deals with E-M1 bodies and the f1.2 Pro zooms aren't exactly new, however most of the time it was just EUR 250-300 off the lens, not 100% off.
The offer is valid in Germany too:
https://shop.olympus.eu/de_DE/promo.html?id=14701
Too bad my financials are pretty tight this month, otherwise I would've bought the E-M1.2 just to get a highly discounted 17mm f1.2 - however the promotion is valid until Halloween.
Currently you can get a E-M1.2 new for around EUR 1300, the f1.2 Pro lenses *new* usually sell for between EUR 750 and 800 on ebay. Which means you'd pay just 500€ for the body alone if you are lucky. Vice versa the Pro lenses sell for around 1100€ around here new, an E-M1.2 on ebay in new condition also would easily sell for around 800€. Which means you'd get the lens for just 300€.