Upcoming low-medium redshift observations will greatly improve our possibility to determine the nature and properties of Dark Energy. In this work we investigate the constraining power of several future surveys on parameters describing the redshift evolution of Dark Energy's equation of state. In particular we focus on Dark Energy models where the expansion is driven by a scalar field also investigating the possible coupling of this scalar field with electromagnetism, which could lead to time variation of the fine structure constant α, in order to understand how this coupling could affect Dark Energy constraints.