Yes, it is possible to level-up with your opposing player,
besides, the Horde like the
On the other hand, it will be impossible for you to run
dungeons in difficulty:
It will also be possible for you to simultaneously collect the many Dracoglyphs scattered all over the Isles.
Cross-faction guilds are still not available, but the developers remain open to the idea. You will also be able to do the Vault of the Incarnates Raid in Mythic difficulty, provided that at least 16 of the players are in the same faction and in the same guild, allowing a maximum of 4 players to be of the opposite faction.
You will still be able to do the Mythic+ as well as the cross-faction raid as soon as they become available when the first season of Dragonflight launches.