I see flaws now already. Thank god it's in beta-state!
Says nothing about able to win a item you already have in either inventory or @ bank. You should not be able to if you ask me.
Also, says nothing about the Gurthalak-issue (correct me if I'm wrong). Today pallys (any specc and role) can roll and win it. Same goes for DK's (no, it ain't a tank weapon, even if blood use 2h's).
Same goes for a few trinkets.
Also, will there be some built-in filtration depending on afk ppl etc? As it is now, ppl want and are kicking afk ppl (seen a few just standing still and also die by will, just to do as little as possible on a few bosses, specially DW). Those should not be able to win items at all.
At least set some active-in-fight aspects into the rolls. If using skills less than 20% of the time (or whatever the absolut minimum would be) then not able to roll. Also gives a warning when you're below that part of eligible players.
Also, as said before (several times). Give PvP-gear a own category when counting ilvl for gear. Count pvp-gear as heirloom (lvl 1) or something. No one really want them for PvE-content, same as PvP-players don't want PvE-players in BG's.
There is craftable PvE AND PvP-items for a reason if you ask me.