In a new interview with Entertainment Weekly, it certainly seems as if Professor Wells/Reverse-Flash actor Tom Cavanagh has dropped another hint that The CW's Flash is headed for Flashpoint. On the use of the Speed Force, Cavanagh stated, "If you know the Speed Force, it’s fair to say that Barry’s abilities come from a positive culling of the Speed Force. Reverse Flash’s abilities come from what Barry would call a negative culling of the Speed Force. Truthfully, the Speed Force is important to both of them accomplishing their goals and the Speed Force doesn’t separate. As they fight towards what they really want — or think they want — they are going to have to take advantage of that Speed Force. I say, ‘think they want,’ because if you’re familiar with the mythology, what Barry needs and what Barry thinks he wants aren’t always the same thing.”
Of course, the most famous instance of Barry using th Speed Force to get something that he wants but doesn't necesarrily need occurs in the DC Comics 2011 miniseries, Flashpoint from Geoff Johns. The story is centered around Barry's use of the Speed Force to travel back in time and save his mother from Reverse-Flash. In succeeding, the entire timeline is changed, with Barry never gaining his super speed, the Justice League never forming and the world becoming desolate as a reult of a war between Aquaman and Wonder Woman.