This gave the makers a window to bring back Loki and Russo brothers in fact confirmed a while back that Loki is alive as he teleported . The Disney+ series will be answering the question that Endgame did not shed some light on where he went from there and what he did with the tesseract.
Also the makers have now hinted the inclusion of Captain America in the series. It is being anticipated that the two may cross paths. Explaining what they had in mind for the Russo brother explained
“Loki, when he teleports away with the Time Stone, would create his own timeline. It gets very complicated, but it would be impossible for [Cap] to rectify the timeline unless he found Loki,” Joe said. “The minute that Loki does something as dramatic as take the Space Stone, he creates a branched reality.”
“We’re dealing with this idea of multiverses and branched realities, so there are many realities,” Anthony said.
Captain America lived in a separate timeline in order to spend his life with Peggy Carter, this was separate from the one MCU fans had been following.
“Correct, so he would have to come back to this timeline in order to hand off the shield,” Joe said.
“There’s a question of, how did this separate timeline Cap come to reappear in this timeline and why?” Anthony added.
Both filmmakers said those would be resolved in future storytelling from Marvel. The possibility of seeing Capital America again is certainly exciting. Lets see how things unfold, if we know anything about the brother by now , it is that not all initial plans materialize into final product.