Some points of what I think will happen.

Honda alternates with the Accord design. One generation conservative, the next, a little more expressive. And back again. The Civic generally gets bigger and more powerful, and some people say that the pattern with the Accord can be seen with the Civic as well.

The Civic should get bigger. The competition is sizing up as they bring microcars into their lineups (i.e. Scion) and the Fit is coming to slot under the Civic. The engine will get bigger. How much bigger, well, I think a 2.0 liter isn't too overzealous for my forecast.

The RSX will move upmarket slightly every year from 2005 until the end of the current model around 2007-2008. Acura doesn't really like to sell the base model except to get people to consider the model. They want to sell leather-equipped models and preferably the Type S. Hence a Civic Si will move in again to catch people who can't get a RSX or don't want such a specialty sports coupe.