Vistra Corp. (VST) is one of the stocks most watched by Zacks.com visitors lately. So, it might be a good idea to review some of the factors that might affect the near-term performance of the stock.Over the past month, shares of this company have returned -5.4%, compared to the Zacks S&P 500 composite's +2.9% change. During this period, the Zacks Utility - Electric Power industry, which Vistra falls in, has gained 4.6%. The key question now is: What could be the stock's future direction?While media releases ...