For the record, this is what the UK PM has on the table for negotiation.
The four key points from David Cameron's EU letter - BBC News
Some commentators have said that he may "pull a few rabbits out of the hat" also; I take this to mean that he has other, private, ideas that are subsidiary to these publicly announced concepts.
There can be little doubt that a two stage EU exists already; The countries using the Euro as their currency (the Eurozone) and the 9 remainder.
Arguably, there are even more stages to the EU with countries such as Greece in such great debt to the Euro central bank that they have given up all but a figleaf of their democracy to the "central powers" based in Brussels.
In essence, Greece is bankrupt but is kept afloat under tight control so that it can remain in the Eurozone.
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Dave
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