Immediately after the Supreme Court verdict in the case of King v. Burwell was handed down, the Wolf administration announced that it will no longer seek to create a Pennsylvania health insurance exchange.
In a news release, Governor Wolf explained that

I took steps to protect Pennsylvania’s consumers by putting in place a contingency in the event the Supreme Court ruled people are not eligible for subsidies, but I am pleased to say that we will no longer need to rely on this plan.

See the news release here.