The VA is obviously talking about Kasumi's seasonal visit to Ash and Co. (like she did in Hoenn and the BF). And Kasumi isn't really THAT stale. Her off-time as Gym Leader kinda refreshed her and made her stale towards us cause we haven't heard from her for ages.
Haruka and Masato (and to a lesser extent, perhaps maybe even Shuu and/or Harley) might make their seasonal appearance in Sinnoh. Haruka is definately going to make one sometime in the future. The Japanese Haruka fans made sure of that. >>;;
I think that's what Kasumi's VA was talking about, saying Kasumi will make her brief seasonal apperance like she did in Hoenn and the BF.
Misty will probably return for her seasonal visit. I mean seriously, it's almost inevitible considering like Prof. Oak, she is the type that would have an episode or two and then leave. The only thing I'm wondering about is May since it's kinda impossible to have a full epsiode with May in it since she is in Johto (that's why hopefully after the end of the sinnoh GF, May could appear).
To be back on topic...do I think Misty is returning...possibly.
I hope not. Honestly, the only thing worse than Cybercubed vs. The Idiotic Misty Fan of the Day is a stampede of Misty-related insanity. Is the color of the rubber band in her hair a shippy hint? Isn't she better than every character ever, and not at all cliche? Does she have better legs than Dawn? If Misty was pitching for the Dodgers, would they beat Dr. Eggman? (There is actually somebody who would ask that last one...bonus points for anyone familiar with the nut.)
Well, then again...they might bring back May instead. Scratch the above paragraph - not only would all those questions be asked with regards to May, but the Misty fanbase would get agitated and start a stampede of insanity. Fun for the whole borderline-psychotic family.