Blizzard talked over the fact that they would like to the original spirit shard concept, however like refine it. They are willing to want the loot to continue to be worth the effort even months after release. To ensure this they will likely be making some gear enchant effects available for shards there, in much the same way as shoulder enchants are available from vendors in Shattrath.
While the shards will only be available from inside instances, the gear rewards will be heavily PvP focused. This is because your faction had to complete a PvP objecting to gain control and the shards to begin with.
One of the most interesting technical issue is how to have the U.I. dynamically change view distance relying on the number of characters near you. This is being looked at so that when the zone is packed, it will dynamically lower your view distance so that the game continues to function at a good speed.
On the balance side of things several things are being looked at. A good example is he bonuses granted if you lose are still being tuned to ensure both sides have a fair fight. Also capturing of graveyards so that the offense can advance, but ensuring the defense can still rez somewhere.
The zone is still in development as siege weapons are here. Blizzard made a discussion for many of the issues they are touched upon. One simple thing is to make sure that there is enough room that the players have enough space to fight. At the same time they discussed another thing that make sure that the players can see what is going on. Therefore they don't drive a siege engine towards the bridge to make it over.
In general the zone looks like it could be a blast, and will be likely to have a busy time for a long time after release. However, it is hard to tell us how the mechanics to work right now. Also few players were thrilled by the concept of fighting PvP to get the right to fight PvE for rewards.

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