Along with the changing times there are new changes and variables has been taking place in laptop designs. Below factors may need to be considered while purchasing laptops.
New form factors: You can get with detachable screens and use laptop as tablet.
Touch screens: Windows8 interface is more useful with touch screen.
Optical drives out, storage goes to flash: Use flash based storage rather than hard drives.
Some ports have vanished, others are fewer in number: You can sue laptops with USB points, video out and card reader.
Thinner, lighter and longer battery life: Giving battery life of 7 to 8 hours which enable you to work full day.