Is this sort of a preview to how the Battlecry games will work? I'm not 100% clear on how Battlecry will work yet, but this seems like something that would go hand in hand, from what I heard.
Also, this reminds me of the EWL tourney. For (V), it was very competitive, and I know I enjoyed it, I think the other members did too. We didn't do too bad in it, either.

Now to the actual new clan war system:
I like the idea of preparing for your opponent, it makes it like a real war, when you prepare your troops, weapons, etc. Also, 5 Battles in the war is good, better IMO, because most wars consist of more than 3 battles and 5 battles can prove better who is the dominant clan.
Although, in battles, the Generals sometimes prepare sneak attacks, kind of like when you pull a random setting out of your ass in a clan war, hoping to get a fairly easy win. Then at the end of the war, both sides are laying it all out on the line, everything they got, strait up trying to mutilate the opposing side.
So, I would suggest each clan picking a set in the open, then picking a secret set for the 3 and 4th rounds, and finally, if a last round is needed, go old fashioned and lay it all out on the line with 1.0 100lt. (Not saying you can't take that in an earlier set though.)
This could also be not very good though, since it's best of 5.
There are both positives and negatives to this, and hopefully (V) will be able to sign up for a ManWar in the near future. ('Cuz only real men Clan war, only nubs nubwar).