There are now public information about the products price of the upcoming Fly The Maddog X. The new and advanced MD-82 simulation will be available either for P3Dv4 at 70 EUR (+vat), or for FSX and P3Dv3 at 57 EUR (+vat).
If you get it fast during the first week upon release, all new customers will be able to purchase it at simMarket with a 5 EUR discount (for FSX/P3D v3). Owners of the good old Maddog may have a different offer whose details have not been revealed yet.
Edit : prices have been clarified without VAT and the 5 EUR discount will be available on the 32bit Edition only.