In the spooking it episode (s3 ep7) Amy tells Karma that she only wanted Liam because she can’t have him. My theory is, that this will become an important occurrence. This will be a parallel, in which Karma will realise her feelings for Amy after Amy has completely moved on from her and starts dating Sabrina.
Her feelings will progress, the last episode will be the turning point, and season 4 will be her dealing with her feelings, like how Amy was dealing with her feelings in season 1.
I think the guy Shane is kissing on the super tease video is transgender. Carter even said so himself that they will be introducing a transgender character in their bunch. A twist to the mix.