I have no idea why Nintendo has given less than 24 hours notice of their next Nintendo Direct event. Or why it’s been announced via Satoru Iwata’s twitter feed.
The event seems to be happening across several regions as Nintendo Japan are kicking off at 1pm (4am in the UK) but Nintendo UK has since tweeted that they’ll be covering an event, hosted by Satoru Shibata, at 1pm CET (12pm in the UK).
The Japanese webpage is here but if you fancy a lie in and want the announcements in English, Nintendo UK linked to this site. Expect the announcements to be much the same and probably focussed on the Wii and 3DS, rather than anything exciting about the Wii U.