We are changing the way respawns work in Battle of Gilneas. The following is an excerpt from the PTR Patch Notes: http://eu.battle.net/wow/en/blog/1959705#blog

Graveyard Changes

Players who die at a control point that they own will now be teleported to the next closest graveyard, instead of the one at which they died.
If a player's team owns the Mine and Waterworks, and dies at Waterworks, they will be teleported to the Mine.
If an Alliance player's team only owns Lighthouse, and dies at Lighthouse, they will respawn at their base.
If a Horde player's team owns Waterworks and Mine, and dies at Lighthouse, they will respawn at Waterworks.

02/03/2011 2:39 AMPosted by Aìmz
it's impossible to kill everyone before 1 or 2 come back.

Although we do feel that it was a little hard to completely control the defence for long enough to effectively pull of a cap (hence the GY changes), a some positioning and planned CC can be pretty powerful in dealing with this sort of situation. One tip could be that as you're killing players off from around the flag area, that you move parts of your group towards the opposing teams GY, or at least position them between the GY and the flag in order to slow down respawns.

While this is not as much of an issue or concern after the GY changes however, the same tactic can be applied to intercepting enemy groups before they even get to the flag, effectively causing a staggering effect on the enemies assault, thus breaking a lot of the initial pressure.

RBG - Gilneas