USCIS confirmed that all I-140 petitions filed concurrently with an I-485 application for adjustment of status are to be filed with the Dallas Lockbox, unless the I-140 is accompanied by a request for premium processing, Form I-907. Concurrently filed applications that include a Form I-907 attached to the I-140 should be filed with the NSC or TSC, depending on the location of the petitioner.
The news item and related documents are available here:
http://www.immigration.com/newslette...prmprocss.html
Please note, for now (June 2008), premium processing is only available if you meet ALL of the current requirements:
1. Your are currently on H-1;
2. Your H-1 status is expiring within 60 days when you apply for I-140 premium processing; and
3. You are not eligible to receive 1-year H-1 extensions because your labor certification was filed less than one year ago.