Ok The originals are gone,Silas is the bad guy, and we now in ep 3 meet katsieya the super witch, who loved Silas, but he didnt love her, he loved the original elana, who Kat killed, after silas fooled her into making the immortality serum.
So now she is after silas, silas is after catherine for her blood which contains the serum.
A few new characters have been added, not sure what they are about yet.