Most of the time, what is announced at ShotShow is not available for many months. This will undoubtedly be true of Nightforce, as their current order time for dealers is many (many, many) months into the future. We have NX8 scopes coming next week that were ordered in May.
This is not just Nightforce. True of most of the high-end scopes. S&B announced their 6-36 scope at Shot Show. ZCO the 8-40, etc.
If you see something you like, buy it now.