Call him ?? I suspect you could post your question and get answers well before he can show up.... When you get the new TV, hook it up with component cables (for now) and check the settings in the "HDTV Setup" menu on the 622. You'll need to be familiar with this menu in order to get things to work on your non-HDTV for the time being (I think .... they may not apply to the S-Video or composite outputs).
Reason I said to use component cables -- which, by the way, can be bought for less than $20 .... do NOT buy "Monster" cables or similar for $40-100 -- is that HDMI still isn't 100% compatibility-wise. Besides, most people can't see any difference.