PD Can Be Carried Forward Even If Old I-140 Is Revoked (Unless Fraud or Misrepresentation) 5 November 2015
This entry is now old law. The new law is at http://www.immigration.com/blogs/i-140-ead-regulations-effective-17-jan…
5 November 2015: After some flip flops, USCIS has gone back to allowing carry forward of priority dates even if I-140 is revoked by employer - as described in this discussion. So, we are good for now.