In general I was meaning the overall technologies you see being utilized in the series. The engine issue was taken care of already so that's not an issue.
Regarding tech from the various series OP super weapons are generally not realistic but others are:
(Ender's game) drone usage would most likely continue to advance and become a standard weapon used by warships. Ansible, I'm not sure that would be feasible currently as there are no existing theories to properly hash that tech into existence. Screeens, medical tech, training suits, controls (except for Ansible) seem probable. Giant kill gun, not so much.
(Star Wars) Lightsabres have been discussed in this thread, Deathstar is a no go at this time, displays and controls seem acceptable, robots/androids are possible, Shielding to a degree is possible.
(Star Trek) Shields are to a degree possible, communications to their level unknown, general ship systems are possible, super weapons are not possible at this time, Phaser/pulsed energy projectile weapons exist to a degree already, antimatter weaponry would take a lot of work to make (we can create it but can't sustain it and not in quantity.)
(Continuum) Time device is out, general tech as far as I recall would be in.
I think that the future of war tech by this time would be a combination of various tech but would include drones, advanced missiles probably with non chemical engines, bullets/projectiles but probably with an alternate launch system, energy weapons would start being in use more as they already are now, etc.