According to Matthew Tempest, political correspondent of The Guardian, in his online report on the signing of the constitution:
The new "rulebook" for the EU replaces over 80,000 pages of legal documentation accumulated through a variety of treaties bonding the original European Economic Community of 1957, and was prompted by the accession this year of 10 new member states, mostly from the former Soviet block.Er, no Matthew. I think you are a little confused here. The 80,000 pages to which you refer encompasses the acquis communautaire, the "lawbook" for the EU (and it's 97,000 pages anyway). This remains unchanged by the treaty, although it is being added-to daily under the existing treaties.
As for being prompted by the accession of the ten new member states, our readers know different.