Looking at the two scans through Google translate it sounds like a lot of the new mechanics introduced in Langrisser II were already confirmed, such as no permanent deaths, archers acting the way they do in LII, classes keeping bonuses, they even talk about the summoner being a thing.
Oddly they seem to mention in the second issue holding down B in battle would stop you from killing a commander to allow weaker units to finish them up. Which would be neat I guess.
It also seemed to say, again all machine translation, that Ledin and Chris son(s?) would be the main hero and lance and namu daughter the heroine. Lance they had hoped to bring in a dramatic fashion and issue one seemed to say that only Taylor and Jessica were confirmed also that same issue had already established Jessica had used the rebirth spell.
Its interesting to me how much of this lore stuff from the rebirth to Lance and Namu's relationship was established so early. Issue two also made clear that Langrisser would have a counterpart sword for Boser.
It's neat to find interview stuff like this and be great to have it translated legitimately. They seemed to have thought they'd get the second game out in 1993 but it didnt come out until 94 wondered what happened or if it was just overzealousness.