yes! – New enchant to be learned in 2.4 Shatter a Void Crystal into two large prismatic shards.. Realm economics prediction.
Guild banks will empty themselves of Voids and convert into Shards thus driving down price/value of shards by Ahing the results
Guild banks will convert all voids into shards and keep in guild banks. ( not so much effect)
Void crystal values will go up and Shards will stay the same. /cry
Either way Im so hoping a) I get that… and b) it brings the price down for the Large prismatics.
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Pugnacious Priest's Warcraft Blog 
I know for a fact that our guild will probably just keep hoarding voids into the guild bank.
At most we might stop selling voids for a while to see where the new price ends up at.