According to sources, reported by Reuters, European Union regulators will vote on a plan to block the merger of NYSE Euronext (NYSE:NYX) and Deutsche Boerse on January 17.Another individual said the meeting was expected to lead to some fine-tuning of Almunia’s recommendation but would not reject it. The committee’s opinion is non-binding.NYSE Euronext (NYSE:NYX) has potential upside of 38.9% based on a current price of $26.82 and an average consensus analyst price target of $37.25.