Arena and Rated Battleground Season 10 is ending November 29. Given this information it is possible that patch 4.3 will be released soon after. This will probably lead to many inactive players coming back to the game rushing to get first dibs on the latest equipment from the new 5-man dungeons and raids. Because of this, the demand for in-game materials will eventually increase dramatically. There are a couple things you will want to keep in mind before the new content is released. It is a good idea to be prepared now instead of getting the short end of the stick at patch release.

Conquest points are converted to honor points
At the end of Season 10 all conquest points will be converted to honor points. The points will cap at 4,000 honor. Spend your points wisely and keep in mind that Season 10 items will then become available with honor points. Blizzard has already made everyone aware that higher ilvl PvP items will be introduced and available for Honor points with patch 4.3.

Valor points will be converted to justice points
Same as with conquest points, valor points will be converted to justice points and capped at 4,000 points. All remaining points will be converted to gold.

Gem and enhancement item prices will increase
Along with new gear always comes the need for enhancements to those pieces. Expect all gem and enhancement item prices to skyrocket once patch is released. It is in your best interest to stockpile as much as possible of the common enhancements you will be needing. This includes various types of raw gems, leg enhancements, and enchanting materials including heavenly shards.

Play the Auction House
It all comes down to supply and demand. It will be a little difficult to know what materials will be worth the most after patch. The economy will be affected by what other players will be stockpiling and making available for sale at release compared to you. Take a look at the 4.3 patch notes to get an understanding of what is changing with the release of the patch. Doing so will give you an idea on what to look out for on the auction house. Prices will be fairly low until the day patch hits. Grab what you can now while supplies last!