basically the new units fix a dozen of problems. imo
viper is just anti protoss death ball with stalkers/colosus/sentries (forcefields)
swarm host is pretty weird.. i guess it is just a basic harass unit/maby possibile cheese factor?
i seriously have no idea what the replicant is for
seems pretty random
oracle is probably to make the protoss play style much more skillful and not just gay allins, now the protoss players actually have to be good cuz macro will be alot more valid ( because it helps protoss keep up the pace ) in such kind of play that we dont see, or rarely do
tempest is probably just to encounter any kind of air play by zerg or terran, probably forces the pvz to go into the hydra roach viper style which i think will flatly crush deathballs instantly, have no idea what effect it will have in tvp
the terran units make no sense