On May 1, the American Civil Liberties Union and many other public interest groups filed a lawsuit on behalf of some Pennsylvania voters who do not possess government-photo ID cards. See this press release, which has links to the complaint and details about the individual voter plaintiffs.
Most of the recently passed state photo-ID laws from southern states have been blocked this year by the Voting Rights Section of the U.S. Justice Department. But most states are not covered by section 5 of the Voting Rights Act, so whether these laws may go into effect depends on the outcome of state court lawsuits, such as this one. So far the Wisconsin photo-ID law passed this year has been blocked by state courts in Wisconsin. The new Pennsylvania case is called Applewhite v Commonwealth.