#4 - Feb. 14, 2008, 7:39 p.m.
Right, as Gladeus here said the limitation in battlegrounds is per-player. If you die 50 times in a battleground you're no longer worth honor to anyone. The limit isn't "after you kill 50 people", unless of course it's the same person for all of those 50 times.
Getting to your question, there's no currently planned overarching limitations on any PvP outside of the battlegrounds, which would be outdoor "world PvP". You of course have rez-timers to compete with and all of the other inconsistencies that come with world PvP, and as stated in the change any one with the rez sickness debuff is worth no honor. I assume though, however, that Lake Wintergrasp in the WotLK expansion won't be a bad way to earn honor in an outdoor environment.
We're going to be watching the results of the change and limitations may come or go or be altered to ensure that honor is being gained within acceptable boundaries.