STEALTH MODE
В бизнесе стелс-режим - это временное состояние секретности компании, обычно предпринимаемое для того, чтобы избежать предупреждения конкурентов о готовящемся выпуске продукта или другой деловой инициативе.

A term refers to a period when startups keep quiet about their plans. Stealth mode is primarily meant to prevent a competitor, especially one with greater resources, from getting wind of the idea and developing it first. It is particularly relevant before IP is filed.
When I asked for a demo he told me they were still in stealth mode.

I have no idea what they’re building—they’re in stealth mode.

I had to sign an NDA because they’re in stealth mode on that project.