Harrison's role will most likely be seen only in flashback, as she has long since died by the time "Flash" begins. Supposedly murdered by her own husband, Nora was instead the victim of an unidentified killer with seemingly super-human abilities. One of Barry's later motivations in law enforcement and crime-fighting is finding the truth behind his mother's death.
With the Nora role listed as potentially recurring, it seems likely that there is more to the murder story than a simple case of wrong-place-at-the-wrong-time.
Introduced in two episodes of "Arrow" in December, "The Flash" has since become a high-profile pilot project for The CW. It will likely air in the fall of 2014 if picked up to series.
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