As an idea it is great, but it is wrong as a toy.
The purpose of a toy is not just to keep kids busy, but it is to release the imagination.
If you pour a bowl of Lego in front of a child they could build:
a car, boat, plane, spaceship, hospital, nuclear weapons factory, farm...anything. Anything the child can think of, can be done. The child can then create their own interactions between lego characters.
You pour a bowl of these in front of a child, they can...do maths (how fun), create words (probably the most use of imagination), or create music loops (some imagination but with limited options as each instrument only has 4 versions). I don't see the point in the interactive cartoon, as again it is very limited to what the programmer has allowed interactions wise.
Toys these days are trying to be too inteligent. These may be useful in schools but as has already been said, they will be too expensive for most, and surely an 80p calculator could do the same maths problems.