Originally Posted by Asian Inferno
I've never heard of anyone elongating an ending by a patch. Patches are only used to fix bugs and glitches, not add completely new additional content. Locked content is another matter though (If it's already on the disc/programmed in the game).
Portal added a brief post-credits extra scene through a patch to help set up the story of the sequel. But yeah, it's rare, and I've never heard of Telltale patching any of their games for anything other than major bug fixes.