Well if its a refresh then they will just be adding a different motherboard, ram, gpu, and cpu. The case and other features will be the same. So you may not be able to get the same kind of m1530 when the new stuff comes out. I've spent all summer looking for a laptop for college and am still waiting.
I ordered a m1530 new on May 24th and waited till June 24th and canceled since they weren't actually building it anymore and it was just sitting there. I then ordered a refurbished laptop from the Dell Outlet and it came broken and crappy. I returned it and am now deciding what to get.
What will you be using the m1530 for? If your looking at it to play games then I suggest you look elsewhere for now. You can get most any other kinds of laptop with a newer and better graphics card. Also there is many reports that the 8600 graphics card has overheating issues and Dell just released a bios update that forces the fans on the laptop to be running at max 90% of the time.