I've been thinking about this, and I noticed no one else seems to be talking about it. I think this is because people know that there is no level cap, so most people are thinking along the lines of, "well, it's only a matter of time until you max out, so what's there to really talk about?" Please allow me to show you why I believe this is a topic worthy of discussing.
Let's say you only get one point per level to assign to your SPECIAL's, that would mean you would have to be level 43 until you max out all your SPECIAL's. How many points will you need to max out your Perks? Well, we know there's over 270 slots, so let's be generous and say 275. Added to your SPECIAL's, that would mean you would need to be level 317 to have a maxed character.
Please take a moment to imagine how much time it would take to reach that.
While I believe this game's content to be massive, I have serious doubts about them offering enough content to keep someone entertained long enough to reach that rediculously high of a level. To accomplish this, Fallout 4 would have the be the largest game not only in the current history of gaming, but possibly well past the next generation of gaming as well. People would talk about this game in hushed whispers saying, "you know, I heard of a guy that actually did everything, and then he lost his mind and built an actual vault in his mother's basemant and he's living there to this day."
Now, don't worry, because I beleive there will be oppurtunities to not only speed the process up, but to actually have a maxed character before acomplishing everything in the game. For your consideration and discussion. I offer you my concepts of what could possibly be available to us to help accomplish having a maxed character.
1. Bobbleheads
We're going to have them, and they will be important. I assume there will be one for each SPECIAL and one for each PERK. Each bobblehead will allow a point to it's description, so there's 77 points right there. I'm assuming that if you were to have maxed out a Perk or Special and then later discover the Bobblehead pertaining to that, it would give you a free point to distrubute however you please. With this, it knocks the min level needed to achieve max-stats to 240
2. Skillbooks
I do not believe there will be skillbooks.
3, Implants
If implants are in FO4, I believe they will offer it's own perk and won't effect anything else.
4. Intelligence Bonus
This I actually believe will be the key. With a high intellegence, let's say you score 2 points instead of just one. Well, with the Bobbleheads, that knocks your min level for a max character down to 120.
120 is actually in the ballpark, be it deep in the outfield, of achieving max-stats before acomplishing everything the game has to offer and you're resulting to grinding.