There has been some speculation for some time now, that a new version of the Nexus 10 would be coming from the factories belonging to Asus, rather than Samsung. But those rumors also had the new slate being made available in time to capture holiday sales, which obviously did not happen.
Just a month before the Asus rumors started in earnest, Google's own Sundar Pichai told a Wall Street Journal reporter that a Samsung built Nexus 10 was coming in the "near future". It seems that we really have no idea which manufacturer will be producing a Nexus 10 (2014), if indeed such a device is on the way. What we do know for sure, is that right now the Nexus 10 is completely out of stock at Google.
The 32GB Nexus 10 is now sold out
source: Nexus10 (32GB) via AndroidAuthority