Chapter 63 is out in English.
Unlike what some expected, the letter was more of a catalyst for what happened between Hajime and Momoka at the end of the chapter. While Hajime seemed to have the letter on her mind, the actual conversation touched on what Hajime said to Momoka after the Festival(that there are other people there for her) and it seems as though Laureley being able to go pro is at least as much of a cause for what happened.
I personally think Himari will get involved once again, since not only is she already close to Momoka, but it could be a chance to deepen her connection with Hajime, since Himari and Hajime haven't interacted all that much. Additionally, Momoka also points out that Laureley has gotten closer since Himari became its manager.
Incidentally, I wonder if the English version of this chapter was translated from the Spanish version, since I saw a few cases of upside-down exclamation marks(for example, the only speech bubble on the third-to-last page).