Nikkei has made a couple of announcements ahead of Nintendo's E3 conference tomorrow.
For 3DS, the paper says that Nintendo will announce a large screen version of the system. The new version will have a 4.3 inch screen, or 1.5 times the current size. A release in North America, Japan and Europe could happen as early as Summer.
Regarding the Wii U, Nikkei says that it is expected the price will be around 30,000 yen.