They are not doing a "redo" of climage change. They are reassessing the temperature records, given multiple criticisms about data quality, statistical analysis of the data, interpolations, multiple levels of mathematical tinkerings with the data, etc., and providing the final output as open source code, so that everyone can view it, criticize it, improve it, etc.
Reassessment of the temperature records will not "end" global warming. It may merely confirm it. To what degree it will do, that will be interesting to witness. If they release a version where the final global output has a smaller warming trend than all the other temperature records out there, there will be controversy to no end. If they release a warmer version, the blogosphere will also go bananas with it.
All in all, entertainment is guaranteed

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