TFT patch notes??

Is there an official league publication for the TFT patch notes? I can't find them anywhere. The best I've come across is third party sites (which aren't always updated properly) that likewise can't find anything except on Twitter?? There's got to be a better way.

Similarly, I have found no way whatsoever for PBE patch notes. I heard they released Pantheon, but am 100% clueless how to find details. Help?