Looks like Fall 2005:

"Ford is accelerating its development of full hybrid-electric vehicles. Although the company has announced no additional models to those already targeted for deployment as hybrids, the time to production has been compressed for some. The previously announced Mercury Mariner Hybrid will go onsale this year—12 months ahead of the prior schedule. "

Read entire article at:

http://www.greencarcongress.com/2005...ccelerate.html