I don't think they want to tie into Smallville.
For fun, though, in the scenes in the arctic with Dr. Hamilton, they had the computer guy, Sekowsky, played by the actor that played Dr. Hamilton in Smallville...
There was a Smallville
nod every five minutes--all the way down to the font on the water tower.
Heck even the plot sort of was since, to be fair, SV did do the "New Krypton" story first.