in a few days; in the near future; soon
Used for events expected to happen within the next few days, not for distant future. Often used in announcements or promises.
I will contact you in a few days.
The new product will be released soon.
Compound of 近日 (きんじつ, 'soon, in a few days') + 中 (ちゅう, 'within') + に (adverbial particle). The phrase is a fixed adverbial expression.