Is it just me or does anybody else see potential hooks for DLC in these?
Oblivion had a whole bunch of stuff that could've potentially been tied to DLC/expansions/sequels too, but they ended up not. I wouldn't look too deep into it, as DLC and expansions are usually their own thing and not derived directly from in-game sources (Tribunal, Bloodmoon, Knights of the Nine, Shivering Isle.. all pretty much came out of left field for their respective games).
"You have won a mighty victory. Sahrot krongrah (Mighty conquerment) - one that will echo through all the ages of this world for those who have eyes to see.
Savor your triumph, Dovahkiin. This is not the last of what you will write upon the currents of Time."
obviously, something big is going to happen
also, i remember something about you being the scribe of the next Elder Scroll. (... elder scroll, for you shall be it's scribe). dunno who says it.
It was Martin at the end of Oblivion's MQ. And you did write a scroll in Skyrim. The Elder Scrolls immutably record events that happen, while showing an uncertain future, so you "wrote" the scroll that records Alduin's return by going through Skyrim's MQ.
Those quotes are basically TES's fancy way of saying "To Be Continued".