To get a look at Ms. Swan below...
Smallville's executive producer Brian Peterson descibes Zatanna's appearance as follows:
Our Zatanna is basically the same character that everyone's familiar with, only there's a Smallville twist. We're catching her before she has control of her powers.
You'll get a chance to see Zatanna bring a heavy dose of magic into Clark Kent's life when Hex airs on March 26. Smallville airs Thursday nights on the CW. The drama about the early days of Clark Kent stars Tom Welling, Erica Durance, Allison Mack, Aaron Ashmore, Justin Hartley, Cassidy Freeman and Sam Witwer.