I'll say of the two most likely to be used IPs, Zelda would fit in theme wise more with IoA. Though IoA has a loose theme where everything there is based off of literature if I recall correctly. Which while there is written Zelda stuff, the game came first and it would be a cop out reason to put it in. I think it'd fit very nicely in TLC though
. Pokemon on the other hand I see them more likely to hold off till their south property is shaping up, not only due to it not fitting with IoA all that well but also they still need to deal with the licensor I believe. It would make sense also with how Universal handled Harry Potter (1 land in each park).
I'm just not sure if that's how they'll handle it etc. just me guessing.