The 64-bit repos has a significant number of apps still missing. Most of these are obscure, and a few may be obsolete, but there are many needed/wanted apps left to package. Someone is working on wine-gecko, I believe, but some of these apps are very complicated and will take some more time.
Since PCLinuxOS is a rolling distribution, the directory name does not change when packages get updated. 2011 just means that the 64-bit repo was begun in 2011. If the directories were changed to reflect the current year, then every user would have to update their sources.list.