So one of the changes that caught my eye the most here (and most others', I'm sure...)
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So for once, Splatoon developers have added a completely new area to a stage! Honestly it looks like a very good one to add too. The issue everyone has with the stage is that it's way too attacker-favored and it doesn't seem too unreasonable to get to this new area on lockout. If you are able to get there then you'll be able to approach the spaces attacking teams normally hold at a different angle from the top route that normally is a defending team's only option. It is a one-way drop which if anything discourages attackers from going there although we can only hope there'll be a defending sponge or something in certain modes.
Most of the other changes to the two maps seem pretty inconsequential with the exception of maybe the lower green part in Hammerhead's blueprint, which is kind of a shame. Can't say I'm going into this with too many expectations though. I am curious what this means for the Scorch Gorge stuff we saw in the season trailer though...