For those who cannot wait till July rolls around to pick up your LEGO Mini-Piggy Bank (40251) 3-in-1 gift with purchase can check out these instructions that have been uploaded to the LEGO database.
It includes the instructions for the other two alternate builds which are the mouse and the panda.
From the looks of it, the parts could easily bricklinked or culled from your current sets if you are itching to have them built before anyone else.
And if you have enough parts, you could have all three displayed! I’ve included the parts list below and it is also in the instructions which you can download here.
(Thanks to Promobricks for the heads up!)