The official Tales of the Rays Twitter has just announced an upcoming short anime featuring Stahn and Leon.
The upcoming new short anime, entitled Tales of the Rays: Everlasting Destiny. The story will focus on a new story involving Tales of Destiny's Stahn Aileron and Leon Magnus and is connected to the final chapter of the 2nd Tales of the Rays arc during the events of the "rescue."
【お知らせ】
こんにちは。運営です。
発表します。ショートアニメ『EverlastingDestiny』制作してます。
2部終章イクス救出の裏舞台。新編に繋がる物語です。
スタン、リオン達の活躍をガチな"アニメ"で描きます。
劇場でもエイプリルフールでもありません。
テンションにご注意ください。#ザレイズ pic.twitter.com/rgvIHeqiAe— 【公式】テイルズ オブ ザ レイズ (@talesof_therays) January 25, 2019
It seems to be an actual animated short and as the Tweet announced, this will not be a "theater" (or the animated shorts that feature the characters as chibi) and it is also not an April Fool's Joke. As to why they had to announce that, I'm not entirely sure.
More details will be available in the future.