Expect primarily 3DS information with a little bit on Wii U.
A Japanese Nintendo Direct presentation will take place tomorrow morning at 7 a.m. EST / 4 a.m. PST.
The event scheduled for October 25 is going to focus on both the Wii U and the 3DS. Some of the Wii U information will come in the form of additional details on a previously announced title. Most of the presentation will focus on the 3DS.
For those not living in North America, here is a list of times for some regions:
04:00 AM PST
07:00 AM EST
11:00 UTC
13:00 CET
08:00 PM JST (Tokyo Time)