I can't see them doing it. The port of Safari certainly was a surprise to me, but trying to take on Microsoft Office would be unlikely I'd think. Apple, even though it punches far above it's weight, isn't crazy. My bet is that they'll continue to follow the now established pattern of targetting the home user/lifestyle segment, and the graphics pro/publishing sectors. I don't imagine in Apple's wildest dreams do they see substantial penetration into the work-a-day PC/Microsoft arena.
I have to admit to being somewhat of an Apple fanboy (Lovingly strokes Macbook!!), but some of us straddle both camps and still manage to maintain a sane view on the world.