Tomb Raider came out recently for PS4 and XB1, now there are rumors about GTA V and TLOU being remade for current gen.it seems like this might become somewhat common in the beginning of this generation.

What are some of last gen games you´d double dip for sure on PS4/XB1/Wii U?

The Last Story.

Okami for the Wii U - that shit would be amazing - i'd triple dip for that

Twilight Princess
Xenoblade Chronicles
Assassin's Creed 1-3(including Brotherhood, Revelations and Liberation)
Mass Effect 1-3
Red Dead Redemption

Uncharted 2 or 3 that multiplayer.

Interesting list

Red Dead Redemption is also something I would like to see running in powerful hardware that is not PC

The Last of Us, Dark Souls 2, South Park, GTA5, FF and Kingdom hearts HD remasters on PS4 would make me very happy.

The last of us, dark souls 2 and GTA 5

Valkyria Chronicles for PS4. Actually an HD trilogy redone and localized would be better. :)

Only those that really suffered from the limitations of the last gen consoles.

Skyrim could see huge improvements (especially the PS3 version...).
Mass Effect 1 also didn't run that well.
Maybe a port of Gears of War 1 and 2 using the either newest UE3 version (comparable to GeoW3) or UE4.
another chance for Team Fortress 2 on consoles

can't think of much else