My experience with wheel bearings is that if they are repacked when you do a brake job then they should last another 100K miles.

I would not recommend replacing the timing chain as a preventive maintenance item since they far outlast timing belts.

As long as you keep up on the filters and fluid changes you should enjoy your next 100K miles.

When you get over 100K miles on a car pay attention to strange noises and fix the problems when they are small problems.

Some other things that are suspect to wear are engine mounts, hoses, shocks and ball joints.

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Ray
1998 Mercedes E320, 200K Miles
2001 Acura 3.2TL, 178K Miles
1992 Chevy Astro, 205K Miles