Up until today we were all expecting to be able to purchase heirlooms with gold come patch 6.0.2. This was going to happen due to the removal of Justice Points and Valor Points. However Blizzard has decided to make a change and remove the ability to purchase these heirlooms with gold completely from the game. You'll still be able to get them from other dedicated currency, like the Darkmoon Faire tokens -- but that's a far cry from being able to buy them with Justice Points or gold.
Bashiok notes that this change is due to the new Heirloom system that they're developing, and they don't want to set up bad expectations.
As you might already be aware, both Justice and Valor Points are being removed as currencies from the game in 6.0.2. As we started to work on new ways to buy Heirlooms, we found that we were setting their value up for a rollercoaster ride. That's because we're also working on a larger Heirloom system for a future patch, and we don't want to introduce an interim pricing scheme that could temporarily devalue Heirlooms or limit how we'd be able to give them out in the future. Rather than make players face buyer's remorse and hand-wringing decisions about when to buy, we're going to give the Justice Heirloom vendors some time off while we work on improving the system as a whole.
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