No. You will never be able to permanently increase your base stats outside of leveling.
The reason why I'm asking is because TiTs and CoC1 both have that mechanism
Generally speaking, don't use the previous games as any kind of yardstick by which to create expectations for this one. The design teams are different, the design philosophy is different, and the systems and mechanics are largely incongruous.
And if there aren't any plans of implementing such features could you explain why.
1. For the same reason we force everyone's attributes up by one on each level up: to create a band in each level in which we can reasonably expect a player's stats to be. This makes balancing easier as we don't need to balance an encounter for someone having maxed out everything, and someone having just what comes with level-ups.
2. Mindless grinding is not fun or engaging. Spamming 1 to talk to Syri about books, or grinding over and over again at the Ten Ton Gym is not engaging gameplay in our opinion. NPCs are not engaged because players enjoy their content, but because they serve as stat trainers. Grinding is present in the game for those who like it, but the rewards are all cosmetic.
3. We want players to make intelligent decisions about stat builds to complement their powers, classes and companions, not to pump everything to maximum and destroy any meaningful choices about one's build.