Is the battleground timer shared for all brackets now?

WotLK, Lordaeron.

I've recently noticed that the Battleground timer seems to be universal for all level brackets now.

Example: Burning Crusade content. I always show that the Battleground "Average wait time" is very low, yet, it's clear that this isn't the case.

I first started noticing this once the cross-realm queue went into effect.

I've been tempted to submit this to the Bugtracker, but, I wanted to be sure I wasn't the only one, and to also be sure this wasn't intentional, as, it seems only the top bracket (level 80) actually receives battleground summons via the in-game PvP finder... which I still find odd, considering, well, we have three quite populated realms going at it now, and I find it hard to believe only level 80's have an interest in battlegrounds out of so many potential players...