On the very day the Obamacare insurance marketplaces opened for business, a new topic appeared on the HealthCare.gov website:
Although the topic was just added, it is already listed as "most popular":
The write up on this new topic begins:
Starting 2014, most individual plans must offer new benefits and protections. Some plans will be changed or replaced with plans that offer these protections.
If this happens, you can choose to buy a plan in the Health Insurance Marketplace instead. If you switch to a Marketplace plan, you may qualify for lower costs based on your income.