Not much new info on the other guns. They're bassically about what you can expect in terms of appearance/functionality from the previous games.
The Railgun however is interesting. I wasn't sure they were gonna do a railgun, since that seemed like it might overlap with the role of the sniper rifle (precision long range power weapon, except...better). But the fact that it fires high explosive rounds makes it sound like this thing will have a slightly different utility than the sniper rifle.
The rounds don't look to big though. Maybe the idea is to make this thing like a long range grenade launcher with a flat trajectory?