Tkool website was updated with a description of how the RTP will work
https://tkool.jp/mv/new_function/index.html (bottom of page)
Granted, it might not be an accurate translation.
https://tkool.jp/mv/new_function/index.html (bottom of page)
Running it through google translateRTPの煩わしさから解放された『RPGツクールMV』
前作までは、ゲームを制作する時や、そのゲームをプレイする時に、あらかじめRTP(ランタイムパッケージ)をインストールしておく必要がありました。この目的は主にゲームのダウンロード容量を小さくすることでしたが、ブロードバンドの普及によって従来ほど容量を気にする必要がなくなってきたことなどから『RPGツクールMV』ではこの仕様を廃止。新規でゲームを制作する時に、ゲームフォルダに全ての素材ファイルをコピーするようになりました。
I can understand that the purpose of having a separate RTP was to reduce download size, but it seems like the RM devs didn't consider this to be an issue anymore due to the spread of high-speed internet.It has been released from the burden of RTP "RPG Maker MV"
Previous work far, and when you want to produce a game, when you play that game, there was a need to be installed in advance RTP (the runtime package). The purpose is mainly did it to reduce the download capacity of the game, it abolished this specification in the "RPG Maker MV" from such that it has been no longer need to worry about the capacity as conventional by the spread of broadband. When you produce a game in the new, and now copy all of the material file in the game folder.
Granted, it might not be an accurate translation.