To be clear, the Shuttle Program's over after STS-135, unless something amazing happens with the CCDEV-2 situation.
Yes, and at this point additional missions are a secondary or later issue, contingent on the outcome of whether the USA study proposal is funded in CCDEV-2. The commercial proposal supersedes this and there's a long discussion in that thread:
http://forum.nasaspaceflight.com/index.php?topic=24010.0(Including production issues, long leads, etc.)