Unknown but hopefully by at least May. It's possible they're waiting for at least the UK to get their English version before they send the patch out.
that's how you find hidden items
Dawn/Lucas gives it to you in route 207
emuparadise.org
The Pokemon Platinum ID code is CPUE-DO74D1B3. I am not sure if the O is a zero or a 0. So try both. This is the right code.