The next Obamacare open enrollment period begins three months from now — and for health insurance plans there's plenty that needs to happen between now and then. "Without a doubt, there are still challenges that both sides [insurers and the Obama administration] are working through," says Karen Ignagni, president of America's Health Insurance Plans, the trade group that represents insurance carriers — from Aetna and Cigna to hundreds of small, local plans — in Washington. Ignagni expects that the health insurance exchanges can enroll 13 million people during the next sign-up period, the number that the Congressional Budget Office has projected for 2015.