In case someone else needs it, these are the rates:
[wotlk] Lordaeron: x1
[wotlk] Icecrown: x7 experience, x3 gold rate, weapon skills, profession and reputation rates
[wotlk] Blackrock: Instant 80 (only PvP)
[cata] Neltharion: x7 experience, x3 gold rate, weapon skills, profession and reputation rates
[cata] Warsong: Instant 85 (only PvP)
[mop] Frostwolf: x7 experience, x3 gold rate, weapon skills, profession and reputation rates
At the moment there is a TBC Test realm, the future rates seems they will be: x5 exp, x1 anything else