This evening there will be an important announcement from Koichi.
Pikachu announced his retirement from Pokemon this morning.
I'm nervous because I have to give a presentation about my social media research outcome in front of everyone tomorrow.
I'm going to express my departure. That is my only announcement.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. The ひょう changes to ぴょう and the はつ gets shortened, though, so just about everything about this word is weird.