Well, I can see all those '*-3.0.21-tinycore.tcz' extensions popping up in the 4.x repository, so I assume we are going to have kernel version 3.0.21 (instead of 3.0.3) starting with 4.4rc1. That, plus the fact that already new 'config-3.0.21-tinycore*' files and "friends" are available tells me that someone was well prepared and just waiting for a "starter's gun" ...