Ok, one more time with feeling...
What it seems that people are expecting is another content patch that is independant of the expansion. More specifically, a lot of folks seem to be looking for a free content patch, should they choose not to purchase the expansion.
This is not happening. Therefore, the EU CM is correct in saying there will be no 1.13. We will not be patching the original version of WoW any further.
What we are doing is upgrading the game client to 2.0. This is what happens in an expansion.
The patch 2.0 is going to prepare for the expansion. We will release more specifics about what is in that at a later time. For now, consider it as the patch that allows players who don't have the expansion to keep playing with players who do. If we were to fully upgrade to expansion, players who did not get the expansion on release day would be shafted until such a time as they upgraded. We do not want this, so we have a prepatory patch which will bridge between the two versions of WoW.
Therefore, patch 2.0 will be released shortly prior to the release of expansion boxes. There will be no patch 1.13.