I know that the special editions with the silvery cover, etc ... had the errata for stealth, for example (although they included much of the same errata in PH2 I believe). The errata to rules (as opposed to powers, classes, feats, etc) will likely show up in the essential lines, in the form of the rules compendium and perhaps the books on essential races/classes will include some reprinted (and errata'd) material, such as feats like weapon/implement/focused expertise.