[2] The probe may have the opportunity to encounter minor planets on the way out, including Orcus and Quaoar, though such flybys would require specific launch dates.
With next-generation radioisotope thermoelectric generators (RTGs), the mission would be designed to last for over 50 years after its launch, a similar feat reached by the Voyager 1 and 2 probes despite their intended 5-year lifetime.
In addition, neither of them are headed toward the IBEX ribbon, a region discovered by the Interstellar Boundary Explorer where energetic neutral atoms (ENAs) seem to highly affect the heliosphere and are able to breach it at unprecedented rates.
Similar goals may include viewing the Sun as a habitable exoplanetary system from beyond, with potential outbound giant or dwarf planet flybys along the way depending on chosen launch date, and understanding the universe from beyond the heliosphere.
[1] This article incorporates public domain material from websites or documents of the National Aeronautics and Space Administration.