It has now been confirmed that both LEGOLAND Billund and LEGOLAND Malaysia have already started selling the LEGO Brand Store (40305) set dispelling the notion that it would be a promotional set given at out store openings.
Update: The LEGO Brand Store (40305) has already been selling at some LEGO Brand Stores around the world ahead of the June 1st release date which means that this will not be restricted to just LEGOLANDs. *rejoice*
Zusammengebaut first reported seeing it on sale at LEGOLAND Billund for 229.99DKK which converts to approximately SGD$48.
A fellow reader spotted it at LEGOLAND Malaysia over the weekend selling for RM119.90 (SGD$40) which is approximately SGD$8 cheaper.
The box is pretty big and actually looks like it will fit nicely right next to any Creator 3-in-1 habitat.