I don't know if this is confirmed or not, but a translation from a German magazine seems to suggest that Civ V will not allow tech trading. I can see the benefits of this as tech trading could often be abused, but if you play on Emperor(as I do) or higher the AI receives some phenomenal research bonuses. A human player simply could not ever keep up without tech trading, and the game at high levels would become effectively impossible. Perhaps this means that Firaxis is going to nerf tech bonuses at higher difficulty levels and the AI will simply be designed to play the game more intelligently, but I guess we'll have to see. My concern is that with no tech trading, Firaxis will either nerf the high level research bonuses and make high level play too easy, or they wont nerf the research bonuses and high level play will become impossible. Does anyone have any more info on this?