The devs have been describing their philosophy with WoW Forever as "beer and pretzels". Meaning they are aiming for a more laid back and casual experience with WoW Forever. It will not be near as complicated as current retail, according to all the information we currently have.
I think the idea is it's a WoW version for the older gamer with a career and family. I would recommend trying it out because the barrier of entry is fairly low. Get a key from one of us with several to spare and give it a shot.
We don't really know what the end game experience will be, yet. They plan to have 10-man, 20-man- and 40-man content in the end game. The only issue a casual may run into is getting a raid spot in endgame. Even if you're in a casual group, the raid spots are limited. If you happen to be online and can do a raid, there will need to be an available open spot with your group.
However, I would still jump in just for the leveling experience. one of their core pillars is "Journey before destination". They want to get back to the original leveling experience of vanilla. This entire experience is something you can do by yourself and with others you meet along the way.
I haven't played in a long time so I don't know how effective running dungeons in a pick-up group is. Ultimately, raids do usually take several hours to complete, so you do need to be able to commit some time to them. If you are constantly needing to leave in the middle of a raid, people won't want to keep inviting you to them because it stops it for everyone.
PvP is something you can do more solo and on your own time, and there are several ways to get geared through only doing PvP.
The only disadvantage you would have starting 30 days later is that you would be a little later at hitting 60, if you want to raid with a specific group who will be getting there way before you. But there will ultimately always be others leveling at your pace and timeline. The game is meant to be social, so meeting others, questing with others, doing dungeons with others, and PvPing with others is what you are meant to be doing. To this day, I still remember a few people I met on my journeys back in 2005-2006.
It's not a race to 60. Kick back and enjoy the grind. Mess around with your professions. Explore. Do some PvP. Just enjoy your experience, if you decide to give it a go.
ETA: If you are not aware of terminology, a "raid" is an end-game dungeon that requires 10, 20, or 40 others to complete. Throughout the leveling experience, there are MANY dungeons that are 5-man. There are mechanics in the game to help you find groups for these and, though there are definitely some toxic people here are there, the vast majority of players are very helpful and open to giving you advice.