I am guessing that they will reveal a new 3DS that does not have the 3D effect, they are already paying royalties for each system with the 3D effect sold so I think there will be another model with no 3D feature since they are both cheaper to produce and they can be sold for a cheaper price. They also seem to be either limiting the 3D in some games like Pokemon X and Y and the Ruby Sapphire remakes will not have much 3D either so this would go along with that. At this point I don't think too many people are buying this system for the 3D effect.
I don't think there will be anything in the console line, unless its a new model of the Wii U that does the same or less as the current model, because they can't release a new console right now, as the people who bought the Wii U would be very, very mad and not buy their new hardware, and people who are thinking of the Wii U would not buy it because they know something new is coming out. This would not put them in a good position. They also have a mario kart bundle that will release just prior to E3, so releasing a new Wii U doesn't make much sense at this time.
If there is a rumor floating around, don't believe the deny claims, every time a company tries to deny a rumor, it seems to come true soon after. They only deny it so that we will buy their current products.
I don't think there will be anything in the console line, unless its a new model of the Wii U that does the same or less as the current model, because they can't release a new console right now, as the people who bought the Wii U would be very, very mad and not buy their new hardware, and people who are thinking of the Wii U would not buy it because they know something new is coming out. This would not put them in a good position. They also have a mario kart bundle that will release just prior to E3, so releasing a new Wii U doesn't make much sense at this time.
If there is a rumor floating around, don't believe the deny claims, every time a company tries to deny a rumor, it seems to come true soon after. They only deny it so that we will buy their current products.