Does anyone reckon there'll be a DLC where you can improve your character's level above "Level 81"?

I really have some skill tree perks I wish to improve...

On console, probably not, since level 81 (or 81.5) means all skills are at 100. They might add an option to change perks gained per level, though

On PC, there are mods available to increase levels and/or perks.

True. But hence I mentioned in future "DLC's".

I heard there will be at least two more one about the history of the Nords and another where your character becomes king/queen.