$100 Oil: What does it mean for Currency Markets?

It's very strange it is not being reflected in so many currencies.

How will those economies afford it without revaluation of currency vs. dollar denominated oil?

It actually works the other way round. Prices in oil do not cause currency movements, it is oil that follows the exchange rates. For example oil has a strong inverse correlation with DXY.
Higher dollar = cheaper oil. Since most of world's oil is consumed outside of US with people paying in euro and other currencies, oil inverse correlates with currencies bacause it has to maintain its value.

I think means a weak dollar and rising gold