Would it be reasonable to assume that season 2 is also split up into two haves (season 2A being full disclosure to episode 78, season 2B being episode 79 to episode 104)?

ben-levin:

Yes, BUT at Steven Universe we’ve also divided the seasons into shapes:

Episodes 1-26 are Season Octagon.  27-47 are Season Parallelogram.  48-52 are Season Square.  Episode 53 is Season Circle, except in the UK where it’s The Queen’s Sphere (and Mr. Smiley named Mr. Brifflepuff).  Episodes 54-69 are Season Irregular Decagon. 70-85 is Season Equilateral Triangle.  86-104 is Season Tetrahedron.  

Please use these classifications from now on when discussing Steven Universe.