If you don't think he's got some strong opinions by now, I don't know what to tell you. They're not necessarily what you or I say, but he definitely has some plans in mind already.
Sure BB "has plans". Since before FA and the Draft, BB, Ernie, Nick, Josh, Brian and others on the coaching staff have been working up offensive and defensive plans and playbooks tailored for the teams the Pats will face in the 2018 regular season - taking into account the players each opponent has (and their tendencies) and the coaches each team has (and THEIR tendencies) - and figuring out the most effective ways to attack each of those teams on offense and to defend against them on defense.
BB and the others have been working to assemble a group of players who, together, will allow the team to successfully implement as many of those specific plans as possible.
However, as with the weekly game plans, nothing is written in stone.
They're still early in the process of evaluating players individually and in different combinations to figure out what group of 53 (or so) will be able to most consistently and successfully execute as much of this season's specific playboks as possible, while building in some redundancies to guard against losing big chunks of those playbooks when, inevitably, a player is injured.
I'm sure that BB and his coaching staff have developed some strong opinions about what aspects of those plans certain individual players are likely to be capable of consistently executing succesfully (and not), and about what certain other players may be closing in on being able to execute while also offering some other value. I'm sure that there are some players that BB and his staff have seen enough of to know that they are unlikely to be able offer nearly as much as others for THIS season.
However, the situation is very likely still fluid, and the big picture for the roster remains unclear. Britt, Decker, Jon Jones and Cy Jones have JUST begun practicing, so their evals, as individuals and in combinations with others (regardless of what they've done in the past), are still very much incomplete.
As fans - at our distance from the field, the meeting rooms and the locker room - we never have more than a superficial understanding of what most of these players are capable of executing from the perspective of the coaches, and we have virtually zero understanding of what BB and his staff are looking for specifically for THIS season.