Have to wonder how they're going to play the motivation for the aliens returning and why they want to engage in an even riskier assault this time around. The first time they had a massive technological advantage. This time the gap doesn't appear as wide. I'd argue just based on how the aliens were in the first movie, humans as a species are probably deadlier than they are in a military sense. We're a pretty damn warlike species to begin with which sucks for undertaking giant technological capital projects for any reason other than having bigger guns than the "other guys," but thankfully the aliens saved us the trouble on that by jumping our tech ahead hundreds of years. We're really good at killing things since we've been doing it to everything around us and each other since we could walk on two legs and we adapt our strategies in war with exceptional management of risk and chains of command.

The aliens were so mechanically precise, almost insect-like and emotionless in the execution of their goals and strategies. Their strategies and society were also pretty much "all-in" or so it seemed at the time. Humans don't really operate like that. We're very careful calculators when it matters. Those things move giant civilization sized ships to other planets to steal resources almost in a Communist/Hive society fashion while humans seem to have simply managed their resources and have even begun to colonize other worlds hostile to our physiology in this timeline. That alone makes us superior. In fact it makes the aliens from the first movie look downright retarded that we took their technology and managed to spread our species without much incident and without jeopardizing everyone.

There even appears to be post scarcity and the second weakness of mankind, the potential to be divided and destroyed in pieces, seems to not be a risk either since there is apparently a unity of the species and this would only further be the case if there was another foreign threat that mankind could rally together against.

This movie has potential to be interesting just by exploring the angle of humans as a new space faring species and how the rest of the civilizations in the universe, assuming there are any, might view us. For one thing, letting humans get their hands on that technology in the way that they did was an insane fuck up that other advanced civilizations would have to be losing their shit over. First, the aliens invade the relative stone age savages of Earth which assuming there are other civilizations out there, couldn't have been viewed favorably. The aliens from the first movie have to be intergalactic pains in the ass for any other civilizations just because of their "give us all your stuff" culture. On top of that though, the aliens actually lose and now there's a species viewed as primitive enough to be excusably exterminated to harvest its planet, spreading out into the galaxy.

I'm not holding my breath that this movie will be anything but an action flick cash in, but the premise is interesting enough to raise questions that if answered satisfactorily, would make for a pretty good movie. Maybe they'll throw us a twist ending and this invasion force will get destroyed when another alien civilization comes to our aid to eliminate the Intergalactic ISIS of the galaxy, or worse, they come to reinforce the guys coming to correct their mistake and humans lose. Either way, they're going to have to close up a lot of potential plot holes.