Just Called USCIS
I made a phone call today and was transferred to national service center. The representative told me that "All the I-485 cases that were pending due to security check over 6 month will be decided on 3/10/2008". She retrieved this note from her computer. I hope this is reliable.
I think we just have to wait to see what will happen on 3/10/2008.
Good luck, everybody!