[Hervé]

yes, so far only normal maps will be supported...

[thxraph]

is lightwave the only soft that make possible displacement map with maxwell?

[hdesbois]

No, neither lightwave nor any other soft will make displacement maps work with Maxwell 1.0 (unless there is a big surprise when it's out). And LW doesn't even support subpixel displacement (though I think it will with upcoming version _ not sure).
HD