Most, if not all the weapons and vehicles we saw in the trailer were upgraded/evolved versions of what we currently have so it's safe to say they'll continue the trend with future drops. We'll know more about their plans later on so hang tight
As above, I fully expect some futuristic weapons. Whether this would be based on real life, imagined, or a mixture will remain to be seen.
For what it's worth one of the specialists seems to be holding a upgraded looking SCAR rifle in the picture (might be a different gun. I'm not a weapon aficionado).
