status of and/or url to check base packages repo somewhere?

[Jeffrey Bouquet]

  As the Subject: is there a canonical url to check, and a procedure in place yet, to, 
for instance, if one cannot buildworld on 12.0-CURRENT, to access the package .txz or 
whatever and 'pkg fetch ...  pkg add ...' which would substitute for the buildworld 
cycle?  Also, one would be rebooted into a GENERIC kernel, ... and other details ?
....