The battle system of Honkai Star Rail is an encounter system similar to the Trails / Kiseki series.
Several content creators, in English and in Japanese, who managed to get in, shared their gameplay on the beta test of Honkai Star Rail.
You can find the gameplay videos below. miHoYo also detailed all of the main characters appearing in the Honkai Star Rail CBT 1.
MiHoYo just started on October 27 the first closed Beta Test for Honkai Star Rail, and you can find several gameplay streams online, seeing there are no restrictions for sharing content at all.
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Help us with Beta Testing! | Honkai: Star Rail CBT1