Sometime between Saturday and Wednesday, China plans to launch a brand new rocket from a brand new launch site, and conduct a small-scale test of its next-generation crew capsule.

An actual launch target has not been confirmed, but online sources indicate the first attempt will be made Saturday, June 25, possibly around 11:30 or 12:00 UTC (6:30 or 7:00 a.m. EDT).

The rocket is the Long March 7, a medium-lift launcher expected to become the new workhorse of China's space fleet. Among other things, it will be capable of blasting cargo freighters to the country's Tiangong 2 space station, which should launch later this year.

The test flight will also christen China's new spaceport, located on an island in the South China Sea.

It's a big milestone for the country's space program, which has human spaceflight plans that include a three-module space station (launching after Tiangong 2) that is expected to be completed around 2022.