Here's a roadmap:

4.3

24 man raid
1 expert dungeon
1 ultimate raid
tome gear upgradeable outside savage
crafter tribe
1 ex primal

4.4

savage raid
2 expert dungeons
new tome gear
new crafted gear
1 ex primal

4.5

24 man raid
1 expert dungeon
1 ultimate raid
tome gear upgradeable outside savage
1 ex primal
story split in two to artificially extend it

5.0

savage raid
2 expert dungeons
new tome gear
new crafted gear
2 ex primal
aquapolis 3.0

5.1

24 man raid
1 expert dungeon
1 ultimate raid
tome gear upgradeable outside savage
beast tribe
1 ex primal

5.2

savage raid
2 expert dungeons
new tome gear
new crafted gear
1 ex primal
beast tribe

~ TBC ~

This game is already extremely predictable, I didn't even list the extra eureka maps or deep dungeon, but while we don't know when they will be added, we know they are in the roadmap.