The current max level in Tiny Tina’s Wonderlands is still unknown. However, it’s looking at Gearbox Software’s track record it is safe to assume that the max level will likely be LVL50 at launch. This has been the case with previous Borderlands titles.
I assume that once you reach the maximum level cap, you won’t gain any experience points (XP) that count towards your character’s level progression. Therefore, you won’t be able to unlock new skill points beyond that point. I think Gearbox Software will implement another profile leveling system that allows you to keep leveling up and unlock small buffs.
Can You Max all Skill Trees in Tiny Tina’s Wonderlands?
Probably not as this would negate the meaning of skill choices.
Will the Level Cap Increase?
There are currently no announcements from Gearbox Software nor 2K Games that the level cap will increase. However, it has been a tradition that the level cap receives a few increases. With Borderlands 3 this happened every time a big DLC was released.