A Japanese game website called "Dengeki Online" has put of the Q&A in text.
I'll quote the original source, so someone can correct me if I'm wrong.
『FF15』製品版ではリミットブレイク的なシステムを搭載。コスチュームも変更できる【TGS2015】
http://dengekionline.com/elem/000/001/125/1125154/
The part which is creating confusion is the "自分で設定できる4つの武器のプリセットをリアルタイムに切り替えられる" part.
I tried translating which is the following.
Regarding real time weapon changing, it affects the core part of the game and character, thus you can't change every weapon.
In the retail version, you can switch between presets made out of 4 weapons which you can set by yourself. If you want to equip a weapon which is not in your preset, you'd have to open the menu.
I'm not sure about the "you can switch between presets made out of 4 weapons".
Because some Japanese summarisation blogs (まとめブログ

are interpreting it as setting 4 individual weapons to switch through.
Instead of, switching through multiple presets made out of 4 weapons.
Anyways, I quoted the original source since its what Tabata said.
Sorry I couldn't clear up the confusion.