With news breaking about Hikaru no Go being released by Viz Media in late September, CrystalAcids.com has been able to gather some details about its English cast:

Hikaru – Sam Vincent
Sai – Brad Swaile
Akira – Scott Perrie
Toya Meijin – Paul Dobson
Yuki – Cathy Weseluck
Kimihiro – Keith Miller
Kaga – Andrew Toth
Ms. Ichikawa – Kelly Sheridan
Akari – Chantal Strand
Ogata – Michael Adamthwaite

Directed by Rob Bakewell

Additionally, reports about Texas actor Vic Mignogna being in cast are apparently untrue, stemming from him stating at Anime North that he hoped to visit Vancouver at a later date and get a part in the show then.