SHOULD I BUY A Iphone 4 4S case iPhone 5 cover case?

The iPhone 5 is expected to hit in the not too distant future, I WANT TO BUY A CASE FROM http://www.mygooditem.com/p/cross-line-leat-flip-case-for-samsung-galaxy-s2-i9100.html.
>>> SHOULD I BUY A Iphone 4 4S case iPhone 5 cover case?