Blizzard have said there will be a patch before the expansion, it might not be called 1.13, but really who cares about names. Note that like all things blizzard, this is very tentative until it actually happens Some things that Blue posters have implied will be in the patch so far.
What 1.13 WILL NOT contain:
No Drenai,
No Blood Elfs,
No Outlands,
No Arena PVP
No leveling up
What 1.13 WILL contain:
New Talents, the full 41 point talent trees, and talent reset.
New PVP Honour System.
Guide to the New Honour System
Current for the PVP Rank rewards, when you get a rank you can buy the items at the rank for gold. In the new system there are no ranks. You earn 'Honour Points' for killing players and you continue to earn the 'Mark of Honour' for winning in AB, AV and WSG. You you have enough Honour Points and Marks you can hand them in for a PVP Rank item.
There also used to be the BG Reputation items, that when you got enough rep with a BG faction you could go to their vendor outside that BG and buy items from them. Those vendors are still there but instead of costing gold and reputation, the items now cost Honour Points and Marks of Honour.
Here are the Honor Points and Marks
As you can see there is also now an 'Eye of the Storm' Mark, presumable this will be a new BG in the expansion. Also you can now hold up to 100 of each Mark. These are the same as the existing Marks so might be useful to save up 20 of each of them before the patch comes.
http://worldofraids.free.fr/bc/pvp/bgs/marks.jpg
Rank 14 Weapons
As you can see the 2 Handers cost 20,000 Honour Points and 40 AV Marks. The 1 Handers cost 10,000 Honour Points and 20 AB Marks.
http://worldofraids.free.fr/bc/pvp/bgs/weapons.jpg
Rank 12-13 Armours
These are the Hunter armors, but expect the same costs for each class.
http://worldofraids.free.fr/bc/pvp/bgs/armours.jpg
BG Reputation Items
The links below have the BG rep items
http://worldofraids.free.fr/bc/pvp/bgs/av.jpg
http://worldofraids.free.fr/bc/pvp/bgs/ab.jpg
http://worldofraids.free.fr/bc/pvp/bgs/wsg.jpg
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Here are the blue posts on the patch
Drysc:
It was discussed in limited amounts last week, and has at least been hinted at here and there. We will be releasing a content patch before the release of the expansion which will include many of the 'game-wide' features that are not specific to Outland, the new dungeons or zones, or level 70 restricted content (aka the stuff everyone is getting anyway). An exact list has yet to be revealed as we're still working to see what exactly can be included, but all of the class/talent changes are confirmed, as well as the new honor system.
...
I'm not sure of what patch number is being used, so to cut out any confusion it's "the patch before the expansion with a whole bunch of stuff in it". As far as I'm aware there will be a separate "bridging patch" (containing expansion weapons, armor, items, race models, etc. that everyone will be able to see) closer to the release of the expansion. I could very well be wrong and they could be merged, but we will indeed be releasing a content patch before the release of the expansion with a bunch of goodies in it. It's going to be SPOOKtacular!
...
It would be a full release of the new trees up to the 41 point talents, including all of the changes, class ability changes, etc.
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Big thanks to Teza for hosting the images