The ordinary quantum theory points out that general relativity (GR) is negligible for spatial distances up to the Planck scale lP=(hG/c3)1/2∼10−33cm. Consistency in the foundations of the quantum theory requires a “soft” spacetime structure of the GR at essentially longer length. However, for some reasons this appears to be not enough. A new framework (“superrelativity”) for the desirable generalization of the foundation of quantum theory is proposed. A generalized nonlinear Klein-Gordon equation has been derived in order to shape a stable (...) wave packet. (shrink)