Drop him a line now - he will probably appreciate easing his job.

Actually, the new unit cards are very needed, for now just stay out of Teutonics, England, Scotland and Genoa, who will get some new skins in 6.0 and Turks, as they are already mostly done by Sher Khan. He started doing Byzantines, but dunno how far has he went now. Make sure to read this topic (essentially only the last pages) to look at the style we choose and his examples.
http://www.twcenter.net/forums/showthread.php?t=146617
Also, you can PM King Kong, as he needs new icons now, so he can include them in final 6.0.
P.S. Nice job, but I'd like a little more variety - both in angles and poses, take a look at Sher Khan's ones to see what I have in mind. =)