The expression that we will all become familiar with in the next months / years is '
currency war'.
There's going to be a battle between the BRIC nations and Japan, and the traditional power-brokers in the Anglo-American / EU countries. Lots of people are predicting that there will be currency collapses as a result of this. I'm not sure if that's the case, but it certainly won't help the purchasing power of Sterling / Euro / Dollar. I'm sure everything possible will be done to pretend that the level of inflation is much lower than it actually is, as is occurring now.
As a result of this, China will eventually become the world superpower, and will demand a more prominent role in existing global financial and economic instiutions. Or it could possibly claim that they are totally out of date, and demand new ones to be set up with China at the centre of them, but I think this is unlikely.
The dollar will no longer be in any position to be the world's reserve currency so that will be replaced, quite probably by a new global currency. It's hard to say what will happen to all of the individual currencies, but I have seen some quite sensible and knowledgeable people state that all of the individual currencies will be retained in order to convince the public that they still exist in a significant sense, but that they'll all be pegged to a global currency, thus achieving a global currency de facto standard in hassle-free fashion.
I'm not sure how the transition to an even more digitalised currency will be managed, but cash is only really used today for small-scale payments, I think approximately 0.2% of all purchases in value terms. Perhaps by then everyone will be loving using their mobile phones to pay for stuff, and this will help the transition. The monetary system is to all intent and purposes digitalised now, and already based on total pie-in-the-sky, so the only issues to be managed here are logistical rather than ideological.
Nothing will be done to harm the Bank for International Settlements system, as it took decades of hard work to set up, and this is why I think China will not demand that new institutions are set up. The existing institutions have already enabled a small cabal of people to plunge virtually every nation in the world into huge amounts of debt and take control of the vast majority of them, so I think what you will see is an increasing influence of the new dominant power bloc, and decline of the influence of the existing, traditional Western, particularly Anglo-American influence over these institutions. Eventually the news media will tell people that this has happened, although they will deny that it's happening all the way up to the point when it becomes self-evidently ridiculous for them to continue saying this.
Most people will not even notice that anything has happened.