(Update) I've added the full lyrics and romanized them. They come from the booklet, so they are accurate. I'll leave up the "TV size" versions. My transcriptions were surprisingly accurate on those, but I've changed a couple things (I had a kanji wrong in "生誕成長", and I've updated the mystery "親愛なる ???" text).

Alright, folks. This one has been in demand, being the ending of the current FLCL series, and all. I gave a shot at transcribing the lyrics from the TV ending version and the teaser trailer.
A word of cation: this transcription is as heard by non-native ears. There's a high possibility that some of these lyrics may be wrong. Please don't regurgitate these all over the internet until we have conformation.

The lyrics in this one are quite abstract, so it's a bit difficult to piece together. I'm not sure what he says after "shinainaru". I have some ideas, but nothing that I am comfortable with posting. I have seen a couple different transcriptions of the chorus from the teaser, and there seem to be a few different interpretations. A lot of people seem convinced that the lyric is "Century BAND", but I think that "century plant" (or "sentry plant") makes a lot more sense. I have also seen "boy! boy! boy! spiky seeds", but think "reborn" or "born" makes more sense in this context.
If anyone has any input, please post. :bow:
A translation may also come eventually... maybe. Probably not.



[b]Ending version:[/b]
生誕成長 優雅な低空飛行
seitan seichou, yuugana teikuu hikou
握れしめた DISCOVERY
nigireshimeta discovery
細胞はBOOTLEG　相棒はROULETTE
saibou wa bootleg, aibou wa roulette
堂々巡リのADVANTAGE
doudou meguri no advantage
親愛なる ダーウィンとゴー
shinainaru Darwin to go

進化しないまま僕ら
shinka shinai mama bokura
原点回帰の真っ最中
genten kaiki no massaichuu
曖昧さが武器のホラ吹き
aimaisa ga buki no hora fuki
reborn to spiky seeds

[b]Trailer chorus:[/b]
センチュリープラントが
CENTURY PLANT ga
気高く咲き誇るのは今夜
kedakaku sakihokoru no wa kon'ya
最初で最後の産声はF#m
saisho de saigo no ubugoe wa F SHARP MINOR
進化しないまま僕ら
shinka shinai mama bokura
原点回帰の真っ最中
genten kaiki no massaichuu
曖昧さが武器のホラ吹き
aimaisa ga buki no hora fuki
reborn to spiky seeds

-------------------------------------------------

[b]（Complete)[/b]
生誕成長 優雅な低空飛行
握れしめたディスカバリー
細胞はブートレグ　相棒はルーレット
堂々巡リのアドバンテージ
親愛なる ダーウィンとゴー

進化しないまま僕ら
原点回帰の真っ最中
曖昧さが武器のホラ吹き
reborn to spiky seeds

損傷再生大胆なサバイバル
一世一代のアドベンチャー
継承降臨崇高なコーリング
待ち焦がれた独壇場

あくびをしてる場合じゃない

センチュリープラントが気高く咲き誇るのは今夜
最初で最後の産声
reborn to spiky seeds

行こうぜ生きようぜ

センチュリープラントが気高く咲き誇るのは今夜
最初で最後の産声はF＃マイナー
進化しないまま
僕ら原点回帰の真っ最中
曖昧さが武器のホラ吹き
reborn to spiky seeds

-------------------------------------------------

[b]（Romaji)[/b]
seitan seichou, yuugana teikuu hikou
nigireshimeta discovery
saibou wa bootleg, aibou wa roulette
doudou meguri no advantage
shinainaru Darwin to go

shinka shinai mama bokura
genten kaiki no massaichuu
aimaisa ga buki no hora fuki
reborn to spiky seeds

sonshou saisei daitan na survival
isseichidai no adventure
keishou kourin suukouna calling
machikogareta dokudanjou

akubi o shi teru baai janai

CENTURY PLANT ga
kedakaku sakihokoru no wa kon'ya
saisho de saigo no ubugoe
reborn to spiky seeds

ikouze ikiyou ze

CENTURY PLANT ga
kedakaku sakihokoru no wa kon'ya
saisho de saigo no ubugoe F sharp minor
shinka shinai mama bokura
genten kaiki no massaichuu
aimaisa ga buki no hora fuki
reborn to spiky seeds