Looks like it's official... for now.(?)
【『マクロスΔ』劇場版、製作決定!】先ほどまでROCK IN JAPAN FES.でステージを熱く盛り上げたワルキューレ!そのワルキューレが活躍する『マクロスΔ』の劇場版が製作決定!ワルキューレも『マクロスΔ』もとまらない!
【"Macross Δ" Movie version, making decision! 】 Valkyre that excited the stage hotly with ROCK IN JAPAN FES. The theatrical version of "Macross △" that Valkyrie plays an active role is made and decided! Valkyrie also does not stop "Macross Δ"!
From AnimeNewsNetwork:
The Walküre idol group announced at the "Rock in Japan Festiv