My predictions:
1) There will be a stat squish, even though they say it won't happen, (didn't want to make the crowd mad). It happens every expansion, so that the new x-pac seems more powerful. Also they won't allow leveling from 10-50 in every x-pac to include BFA without the stat squish. Because everyone would only level in BFA for highest stat gear.
2) FTP and/or Veteran accounts will be locked to Exile's Reach. This will allow the developers to control the population so no other "unintended gameplay" occurs. It will also separate those players from "quality of life" content, i.e. mount, profession, trainers. It will also encourage players to have active subscriptions in order to partake in the new content.
3) While on Exile's reach, players will be "isolated" from their faction, i.e. their faction symbol on the character selection screen will be greyed out. Once they have completed the starter quest chain and reunited with their faction the faction symbol with colorize. This will prevent players in the starting zone from interacting with those with an active subscription in order to trade, port or get summoned to paid content. This is currently being used on neutral pandaren in their starting zone.
Final thoughts, Activision/Blizzard is about making money, everyone's feelings come second or third.
Rule 1. Make money for themselves and investors.
[Sell you stuff you don't need and get new/old players to subscribe.]
Rule 2. Make you like what they want.
[You see flashy new content, they see better control of how you play the game.]
Rule 3. If they can give the players something they want and it doesn't cost them 'much' they'll do it.
[Reskins anyone.]