When EPIC says Gears only cost 10m they are hiding the the costs involved in developing the UnrealEngine.
When the WarDevil guys say it will cost 20m they have to factor in the cost of developing a whole new engine and the costs of doing R&D for a brand new platform.
I really wish people would stop saying epic is hiding the cost of unreal development. Why should they include the costs of developing the unreal engine, when the licenses they have had over the last 10 years pay for the development of the tools/tech. This tech existed 'before" they were involved with xbox 360. I'm sure the 10 million included a fee to license the engine to themselves internally.