facts

What are the most important facts I should know about we plan to build in this subject scope/next phase (or after if we've completed the subject scope). Instead of an exhaustive list, list only the most critical things with implications across any existing part of the system or future part - for development but also end use. Assume I am new here, but am a capable engineer: write without using any jargon, do not use sloganese or chiasmus, be clear&direct and as minimally verbose as possible (concise but coherent).

subject scope pertains to whatever has been in discussion/planning or just built in recent efforts.