I just recieved the reply mail from TVB today:
謝謝你的電郵。
本科暫未得悉「鋼之錬金術師」電影的播映安排,敬請留意本台日後電視宣傳。
多謝你對本台的支持。
外事部對外事務科謹啟
二零零五年七月十三日
Translation:
Thank you for your e-mail.
We haven't known about "Fullmetal Alchemist"'s Movie schedule yet, please keep adverting our TV commercials.
Thank you for your support.
Something something something,
2005/7/13
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WTF-?
But I think there may be a big possibility that TVB knew about the movie, only they didn't want to spoil us with the time or something, and I think there's a high possibility TVB might change the schedule.
1.Ling, PHOTOPHREAK, you guys watched the last episode air on TV? And the programme called 奇幻潮 before FMA? Well, in 奇幻潮, they said that because of the schedule's changing, 奇幻潮 will be cancelled next week. But in FMA, they switched it to 10:55 to avoid the special programme next week instead of covering FMA too. I think that's a good sign.

;;
2. They have nearly finished dubbing the whole series. Seriousely, they've already dubbed 11 CDs, and they only have 12 & 13 left to dub. I mean, why hurry? FMA only airs once per week, there's no need to hurry and dub all of it so fast.
I hope these are the signs of shedule change.