Actually, I don't think there will ever be a Mac version... not from K-Meleon anyway
K-Meleon is built on Mozilla (which is cross-platform, no problems there) and MFC. MFC, however, is strictly for Windows only. This is like how Geleon is Gnome only. In fact, "porting" K-Meleon to Mac would essentially be a re-write from the gruond up. Perhaps some Mac developers will come up with a good Mozilla-based browser?
Unless there's already one that I don't know about... I have no idea.