What are you most excited to play (Ultimate Team, Career Mode, Offline)?
A repack takes the original game files (often 50GB to 100GB) and compresses them using algorithms like FreeArc or LZMA. The goal is to reduce the download size to 20GB–40GB. When you run the installer, your CPU decompresses the data, rebuilding the game on your hard drive.
New hero cards, icon chemistries, and perhaps new competitive modes.