The new Macs will be running OSX. Intel Macs cannot run OS9 ("Classic mode"), which is one of the older Mac OSes. Unfortunately, some of DAZ' installers rely on Classic mode to function; they are primarily the ones for older items that haven't been updated to work under OSX. .exes don't run at all on the non-Intel Macs, though I'm not sure about the Intel Macs. I believe there are ways to do it, but it may not work 'out of the box'. I don't believe the MacConverter is required any longer in OSX -- at least I have never needed it. For .rsr to .png conversion, there is a nifty little application called xShruggy that handles it, and is, IMHO, well worth the small shareware price they ask for. The DAZ items that don't have pngs usually don't have the rsrs either, though, so you may end up making your own icons for those items.

-D
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It's all fun and games until someone loses an eye texture.