A month or so ago, Apple presented MacBook Air to us. Probably the wolds thinest laptop 
it looks to me like a tray, a plateau where you put your food (now that’s a good application )
It’s god a 13″ screen, no DVD, a CPU that was specially made by Intel, a convenient power plug etc.
External USB DVD is an option but you can also use a CD from any computer nearby to you if you install the provided software.
SSD (Solid State Disk) is an option if you’ve got the cash for it (it’s pretty expensive).
You can read more about it here.