As you may or may not know one of the expansions sloted for Destiny 2's "season 1" is going to be about Rasputin. The question though is does that mean we'll be returning to the Cosmodrome? While Rasputin does have an interplanetary presence we've already seen that his bunker and physical systems are dispersed throughout the Cosmodrome. It'd be kind of weird to have an entire expansion about a character that is only ever interacted with in proxy. I think i'd be pretty lame if the majority of the expansion takes place on like Rasputin's secret base on Titan or something.
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The expansion may have us repair the warmind system. In one of the Io missions, where you go to the warmind vault, your ghost asks about warminds. Ikora states Rasputin is the only warmind, and that his systems were cut. During this mission you can find a scannable network cable that seems to corroborate this.