I've come to the conclusion that one of the following scanarios has happened to Jesiatha.
A: XBL Arcade is bombing hard and the team has to go back to the drawing board... I hope not
B: XBL Arcade is a huge hit and the team is busy making improvements... I hope so
C: Jesiatha doesn't want to be bothered because he is actively seeking to get every high score available. I'm not kidding... this guy gots game
http://live.xbox.com/member/Jesiatha
D: Because he is a Microsoft employee, everything he says can be considered "Official"... and most likely violates company policy even though the information he gathered is available to the public.
Probably D. Thanks for all you have provided us. I hope you didn't get into trouble.