This summer, Titan Comics will be publishing a crossover between the tenth, eleventh, and twelfth Doctors, written by Paul Cornell. (Source)
"According to Titan, the companions in the crossover event will be drawn from the current comic book series for each Doctor, meaning comic book originals Gabriella Gonzalez and Alice Obiefune in addition to the Twelfth Doctor's current traveling partner Clara Oswald."
This is probably what Titan's Free Comic Book Day special will be teasing.
"According to Titan, the companions in the crossover event will be drawn from the current comic book series for each Doctor, meaning comic book originals Gabriella Gonzalez and Alice Obiefune in addition to the Twelfth Doctor's current traveling partner Clara Oswald."
This is probably what Titan's Free Comic Book Day special will be teasing.