I have been out of the loop for a while and came across a guy talking about some changes made, from listening to fan discussions on 1st person and open world exploration.

I get the part about an improved 1P for those that want to experience from that perspective, but remain unclear about this cross faction exploration.

Could someone explain what this is exactly?

Yes 1st person view will be in and w=once you hit lvl 50 you will be able to explore the other faction zones one at a time but it will be an instance zone so you still wont see any opposing faction members but the loot is better in the second area then even better in the 3rd zone.

So, it's like a continuation of the PVE experience in the original faction area?

Are there any other requirements, other than hitting L50? Like...must be part of a certain guild and only be able to associate with them?

Continuation in the one of the other remaining two factions. After you completed that, you get to visit the third faction.

yes, you must complete all PvE ( from my understanding the complete storyline chain quests)

That is quite wonderful to hear. A solo or loner type of player can access the entire map with a single character. Wonderful news, indeed.

This gets me very excited in anticipation for the release. This was one of the main things that was somewhat disappointing from before. I'm glad that ZOS hears the wants of the fans and reacts to make it the experience they are attracted to.

Yes but I believe the devs have planned for those zone to cater to larger party groups of players to make up for a lack of raids.

I assume that to be the difficulty of the dungeons? I have no problem with potentially teaming up with another character I may come across to delv in a joint venture. If a given dungeon proves to be too much, I can accept that and move on.

Ye same here, the loot has to be really good or add another aspect to the type of character i am creating or really fun for me want to play in a PvE group setting a lot.