WDWMagic user Moth is claiming that we might see a Bluey reskin of the Disney Junior show (presumably for both DCA and DHS) and dining.
As for an actual Bluey attraction, most posters over on WDWMagic seem to believe that the most they can see is some sort of standalone Bluey ride. While the IP has legs in terms of popularity, I also don't think Disney would do a fully fledged land to replace something like Animation Courtyard or in the Simba lot.