The 14.1" E6400 and 15.4" E6500 will replace the D630 and D830 while the "essential" 14.1" E5400 and 15.4" E5500 will replace the D530 and D531.
Here's a quick overview of the new features of the 5.1-pound Latitude E6500=
Some photos and a chart with the full specifications can be found at Engadget.UWB, Bluetooth 2.1, mobile broadband Integrated GPS, yes GPS New 84WHr slice batteries for "all day" computing LED backlighting, 1920 x 1200 pixel resolution, discrete nVIDIA graphics and DisplayPort out Hard, Hybrid, and Solid State disk drive options with eSATA jack for more Optional camera and mic Plenty of security options including contact-less smart cards and encrypted hard disks