Update: This Facebook page seems to confirm the details:
- 4,634 pieces
- Price: US $349.99/CA $399.99/DE 349.99€/UK £274.99/DK 2999.00 DKK
Lego just tweeted the first official images of the Lego Ghostbusters HQ, set number 75827. No other details have been announced like piece count or price, but I expect this to be at least £150. It also looks like the minifigures have got printed arms which are different to the plain ones supplied with the Ecto-1.