Will cases for the older Macbook fit the new one or will manufacturers change?

[eye.surgeon]

I'm wondering if InCase and the other case manufacturers have new smaller cases ready to go to accommodate the new thinner macbooks or if they are just going to use the old cases. The new MB is somewhat thinner.

 

[BLACK MAC]

I think the old ones will work fine. However they will probably release a new one just to make money off of it.