I found an article on Acepedia titled "Galaxian H" which also directs me to Mr. Kazutoki Kono's Twitter page in which he mentioned about the "GH" track in Infinity OST album. Here's his translated tweet about it :
"By the way are in the soundtrack of ACEINF "GH" was the Starfighter planning of things using the ace engine. Demo trailer of the song. But trailer is interesting, it Mongaifushutsu due to circumstances."
""GH", "G", of, of "GALAXIAN", "G"."
Can it be that they may wanna revive the classic Galaxian game as a HD remake added with dramatic storylines using Ace Combat engine ?
Remembering that Ace Combat 3 is apparently part of United Galaxy Space Force series, a series in which Galaxian also belongs to, I think it may be possible, even though it's just some speculation as there's no official news about it or the future of Ace Combat series yet.
What do you think about this ?