http://forum.square-enix.com/ffxiv/t...60#post1361160
"Furthermore, it will be possible to move from a new World to a new World, a Legacy World to a Legacy World, and a new World to a Legacy World. In the future, we will look at economic conditions on new Worlds and plan on making it possible to transfer from Legacy Worlds to new Worlds; however, this option will not be available at the start of the World Transfer Service."
The World Transfer back in June/July was between Legacy worlds only as in 1.0 all worlds were in JP datacenter, and they split it into JP and NA/EU.
Also, they didn't "demolish" your old gil. It was a re-valuation where 10 old gil was worth 1 new gil. Everything sold by NPCs or sold to NPCs got scaled accordingly as well, so your net worth was the same before and after, just with smaller numbers.