but why wait is your grandma that tech savvy that she would care? i know mine isnt.. you could save a lil cash if you get one now. but that said if you wanna get a new model one.. and you have time to wait then do so..
The price point will not change in regards to the current MacBook and any future MacBook. Apple tends to keep prices the same.
If you got your grandma a MacBook now and you are a student, it is possible to benefit from the iPod promotion.