I think that they wil get some MD-80's like Aerorepublica. But last year I heard that they where thinking to replace them into some new B717's in 2003/2004. It all depends on the Colombian economy! Well as you know it isn't in a good shape.
So we must wait and see what will happen.
Can't wait to see an 717 or MD'80 in a (NEW) Inter colorsceme!