As far as I know there's no one working on the editor now, so the triangles are probably here to stay. It was developed for MacSoft by Brad Oliver when he was at Westlake, where he also ported Civ3 to Mac OS. He left Westlake a while ago to move to Aspyr. Westlake is now inactive as the rest of their staff moved on to new pastures.
Presumably the rights to the editor code remained with MacSoft, but all the evidence indicates that they are not actively supporting or developing it:
- Civ3 version 1.29 has never been released, although we know that Brad passed a working copy to MacSoft for pre-release QA before he left Westlake.
- The editor is stuck at the level of Civ3 version 1.21, although 1.29 has been out for PC for three years.
- There's a straw in the wind in this forum to indicate that Aspyr may be picking up the Civ-for-Mac ball. If this is the case then MacSoft now have even less incentve to support it.