This inconsistent resource reporting has been fixed in ISE Design Suite 13.3.
The correct values are as follows:
7vx1140t
| LUTs | 712,000 |
| Slices | 178,000 |
| Flip-Flops | 1,424,000 |
| Block RAMs | 1,880 |
| DSPs | 3,360 |
| Available IOBs | 1,100 |
For additional resource numbers, see the 7 Series Product Overview page: http://www.xilinx.com/support/documentation/data_sheets/ds180_7Series_Overview.pdf