Just about every prime time tv program in the last 4 years has been shoot widescreen and framed for 4.3..My bet would be WB would do the same as CBS, ABC and NBC which is the HD feed being widescreen and the analog feed in 4.3
Bill Unfortunatly you will not find a big selection at all of HD sets that accept 720p nativly. The set top box or the internal decoder if so equiped with convert a 720p signal to 1080i, the same way most of us see ABC HD progamming now..