This is true that the EU would have sovereign power over the nations of the EU but this socialist thing is a bit far fetched. Honestly this is the first time I have ever heard of anything like this. The main points of the EU Constitution are to give the EU some legal personality, give the Parliament a bigger role, move to a majority voting system, a proviso for state succession of the EU (this has never existed in any treaty before), as well as other major changes. It also changes some structures like the EU would have a common foreign minister who would operate on the basis of the member states foreign policy. Kissinger once said "I would like to know the number to Europe", a common representative would be better than nations going to each EU member. The European Commission would be reduced to 2/3 of the member states being represented. The President of the Council would have a 2 year term rather than 6 months as it is now. All of these things are really what the constitution is about. The referenda in the Netherlands and France were more about the leadership and not about the constitution it self. 90% of those who voted did not know what the constitution said. Also people say "Socialism" and act like what the Europeans have been doing is the same as Soviet Russia. There is a big push right now to renationalize agriculture because it just is not efficient, just one example of how not all Europeans are following Socialist ideals to the letter.
I just went to a presentation on the EU and its future. One Austrian said he thinks Europe will now be in stagnation for a few years and then after some member states will start to push for a CORE Europe. That would be something that would take over the EU, rather EU members would join that and the EU would eventually disappear or become part of the CORE. This is very optimistic and only time will tell. Personally I am split on how I feel about the constitution failing. One side says it would be good for the EU to better integrate, God knows the current system is second best at best. The other side is really happy because the Euro-Dollar exchange has gotten better so my loans will go further!