"Blizzard has released the currency conversion rates for the upcoming Cataclysm changes. Remember that these conversions will take place when patch 4.0.1 is released. There will be a 'soft cap' at the conversion, so all your work won't just disappear, but there will eventually be a hard cap. Check out the original post for a detailed explanation.
The Cataclysm currency conversion rates in brief are:
To gold:
- Emblem of Heroism = 5.5 gold each
- Emblem of Valor = 5.5 gold each
- Emblem of Conquest = 5.5 gold each
- Badge of Justice = 1.833 gold each
To honor:
- Old Honor * 0.024
- Old Arena Points * 0.85
- Battleground Mark of Honor * 2.976
- Wintergrasp Mark of Honor * 19.08
- Stone Keeper Shard * 1.6
- Venture Coin * 3
- Spirit Shard * 1
To justice points:
- (Emblems of Triumph + Emblems of Frost ) * 2.75"