MichaelCD, thank you for stopping by and asking about the game.
The core rule book contains everything that is in the Beginner Game book, except the first chapter of the adventure, 'Into the Long Dark Night'. In terms of rules and general game play though, it is all inclusive of what exists in the Beginner Game book and also includes character creation, leveling, the complete equipment, Cybernetics, Genetics, Psionics sections, and so on.
The Core Rule Book is just that, with no other attachments or pieces, but it is everything you need to play the game, aside from a couple of dice, and some pencils and paper. Having maps, tokens, etc. is a definite enhancement to game play, but is not required.
The 'Into the Long Dark Night' book includes a short story introduction to the world and characters that are included with the Beginner Game (but are not required to play, and will be made available for download soon for those that want to use them), the three chapters of the story itself, and an appendix that has stats for all of the NPCs in the adventure, and maps of the ships and facilities the players will encounter. However, these maps are all small scale reference maps that are provided so that you as a GM can describe them to your players, use them as reference during play, or even use as models to reproduce them for use using your own supplies. No counters or other parts are included with that book.
Map Pack 1 is indeed the larger, 1" square scale maps from the 'Into the Long Dark Night' adventure book. There are 11 maps included and it will be reprinted soon, using single sheets so there will be no assembly required. That said, they are not only useable for 'Into the Long Dark Night' or even just Falling Stars. They are excellent, high quality maps useable with any 1"/28mm scale table top game.
Thank you again for stopping by and asking about the game. I hope I've answered your questions for you and look forward to hearing about your adventures in the Falling Stars universe.