The Official Blog for ADOM (Ancient Domains Of Mystery)
How much will cost ADOM on Steam?
The final pricing has not yet been determined. Given the fact that ADOM will continue to receive a steady stream of updates I'm right now thinking about the "just under $20" range, but there are good arguments for lesser prices but in game purchases (of features like an exploration mode, *man challenges, etc.). It's a very difficult question and I'm also looking forward to see whatever Valve is going to recommend.
And seeing that games like Rogue Legacy also are priced 14,99 EUR I don't see why ADOM would be worth less.