Welcome 
Brad has left Westlake to work at Aspyr, so he knows nothing of new Civ3 releases. Before he left he passed over a release version 1.29 to MacSoft for final QA and release. That was 6 to 9 months ago an we've seen nothing more. So don't even hold your breath for 1.29 to be released officially.
As for PtW or Conquests? See those flying pigs? Both expansions use a Microsoft-proprietary Windows games networking technology called DirectPlay that no one has ported to the Mac - they'd probably be sued if they did. And I understand Civ4 will still use the same protocols.

Brad has left Westlake to work at Aspyr, so he knows nothing of new Civ3 releases. Before he left he passed over a release version 1.29 to MacSoft for final QA and release. That was 6 to 9 months ago an we've seen nothing more. So don't even hold your breath for 1.29 to be released officially.
As for PtW or Conquests? See those flying pigs? Both expansions use a Microsoft-proprietary Windows games networking technology called DirectPlay that no one has ported to the Mac - they'd probably be sued if they did. And I understand Civ4 will still use the same protocols.

However, on this occasion I really can't see it happening. My guess is that the Mac market for Civ4 simply doesn't support the level of investment that would be required to do it. But I'm guessing, and I have no inside knowledge. I'm sure others will be along soon to provide a more hopeful forecast.
...I would think that now that Destineer/MacSoft (and Peter Tamte) inherited the license from Inforgrames (Atari), a port and closer support would be more likely. Brad gave an amazing contribution to the Mac Civ3 community, but it was largely on his own time.
If worse comes to worse, maybe MS:Mac might be able to figure out DirectX support for VPC (they own the emulator and the original now). Barring that, there's always a possibility that another