I can say that Summer Wars, Mamoru Hosoda’s 2009 film, was decent. I can’t say that it presented anything startlingly new (other than the family angle and the consistently-amazing animation style that I can expect from few other directors besides Mr. Hosoda) because, after finishing the film, I (and a few others: here, here and here) realized that the plot for this film was a latter day revisitation (not necessarily a rehash, but a timely revision) of his 2000 Digimon Adventure film, Children’s War Game.

I can name a few differences in the technological/industrial aspect between Children’s War Game and Summer Wars:

• Children’s is much more replete with A.I. vs. A.I. (in the form of the Digimon characters), while a form of A.I. is mostly posited as a world-eating antagonist vs. the whole of humanity.
• Unlike the less-likely scenario presented in Children’s at the time of its release, Summer was more reflective of the very-likely integration of pervasive Internet-based social network accounts with more superfluous user avatars and persistent virtual environments (like, say, integrating Facebook or Myspace with IMVU or Second Life)
• Because of the lack of a large A.I. population in Summer‘s virtual world (known as "OZ"), the story line is driven more by the contributions, conflicts, hopes and fears of the human participants than in Children’s.

But if Summer Wars is a more timely revision of Children’s War Game, then it is (IMO) logical that a sequel to Summer would be a more timely revision of his last Digimon Adventure film, Diaboromon Strikes Back. This time, the fight (and whatever such a fight would be over) would take place in the real world and after a few years post-Summer Wars, just as in Diaboromon; the key ingredient of such a sequel would be augmented reality (and AR/VR glasses), just as in the 2006 series Dennou Coil.

I just hope that the plot for Summer Wars II isn’t as lightweight terribly composed as Diaboromon. It might need more A.I. than Summer Wars, but I hope that it doesn’t rely as much on its predecessor in order to wow and entrance theater-goers.