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Joel Bylos (TSW Lead Content Designer): There is a long catalogue of lessons learned but perhaps the ones that are most relevant to people who are "gun-shy" after AoC:
We try to maintain the consistency of content across the entire spectrum of the game, rather than the uneven polish that Conan launched with.
We have a much more mature engine, which was responsible for many of the complaints in AoC. We have years of bugfixes done on the game engine.
Shameless plug: I'd also like to encourage anyone who has doubts about Funcom to revisit Age of Conan. The game is free now, and I think just playing it demonstrates the commitment that we as a company make to titles we release. We are not "fire and forget" developers, we care about the worlds we create and we strive to continually improve upon them.