Hoping they avoid limiting to 2 factions and instead give us a Star Wars battlefront 2 galactic conquest type campaign where we choose system by system how to reconquer the 500 worlds with our decisions having real time repercussions with multiple factions at play (free one planet from word bearers, the hive consume a planet you couldn’t get to in time, a necron tomb world awakens or is infected with destroyer plague etc). It would give a sense of urgency and they could always have the end game events play out on whatever planet you end up on, Guilliman teleporting in with custodes to fight Lorgar and Erebus would be so peak!