In line with reports that manufacturing the new iMacs has been problematic for Apple, shipping estimates for the 21.5 inch model in the UK and France have now dropped to 2-3 weeks. The US estimates remain at 7-10 days however it’s likely that they will soon get worse as well.
The 27 inch models are unchanged at 3-4 weeks shipping, and have been stuck with that status since the end of November. Who knows when Apple will be able to catch up, but it doesn’t seem like it will be any time soon.