This could mean any number of things. It could mean that Brave is Erdrick, and he'll be revealed in tomorrow's Direct. It could mean that we'll get release dates for the already-announced ports of Final Fantasy 7 and 9. It could just mean that he's a fan of Nintendo, or that he wants to boost interest in Square-Enix titles on Nintendo consoles.
I just don't want people to get their hopes crazy high, like expecting that Sora will be added to Smash Bros. because the producer of Kingdom Hearts retweeted the Direct announcement, only to be disappointed when the Direct doesn't meet their lofty expectations.