Any plans to tweak the Prestige system?
The answer isn't to keep adding dozens of new tiers, mounts and cosmetic rewards but going forwards there are people who have grinded out prestige levels.
Going forward the current thought is: Keep the Legion prestige ranks, and add new prestige ranks in BFA but when you level up you get some kind of repeatable reward similar to Overwatch.
Will there be more updates to Honor Talents in BFA?
Honor Talents originally started resetting with Prestige levels but didn't end up working out. They feel too much like a barrier to entry right now.
They want to move away from a replica of the original talent tree but instead move to a bucket of talents and you pick any three out of the bucket. They do want to keep the trinket customization row as it's been successful.
Will there be any other PvP updates in BFA?
A new battleground will be coming out soon before BFA. New arena maps. On the rewards and mechanics side there are a couple of changes planned. One of the biggest changes for Legion was using Stat templates.
How will the world PvP work? You said that people across all servers will be separated.
When you enable this feature, you will phase into a PvP only zone. While not everyone can phase into a single phase, you'll only be phased with people also who have the feature enabled.
The exception is RP servers which will follow the standard RP servers rules. Toggling World PvP on, on RP servers, you'll still be able to see players on the same servers with the Toggle off.