What is the importance of maquiladora as a new economic expression in the world economy?

Hardly new. The Mexican maquiladoras have been around since 1965:

http://en.wikipedia.org/wiki/Maquiladora

More generally, special economic zones

http://en.wikipedia.org/wiki/Special_Economic_Zone

have generally been successful, though the degree of success has varied widely, and some have failed

http://www.ifc.org/ifcext/fias.nsf/AttachmentsByTi...

http://www.businessenvironment.org/dyn/be/docs/133...

On the other hand, if the same tariff and tax benefits were extended to the entire country rather than limited to the zone, the results might well have been even better.

http://www.bnet.com/blog/harvard/rethinking-indias...

http://www.adb.org/Documents/Reports/PRM-Policy-No...