Nvidia released the GeForce GT 520 last week without any fanfare or marketing. The GT 520 will be the new entry level product and may confuse buyers who also notice the previously released GT 430. See the difference.
Here is a list of all currently available graphics cards that are DirectX 11 capable, along with links to product details for each, courtesy of Amazon.
This list, revision 19, is current as of April, 2014. See the list.