Update2: 75955 Hogwarts Express and Hermione Granger is now on backorder.
LEGO BrickHeadz Harry Potter & Hedwig 41615 (on backorder) and Hermione Granger 41616 (instock) are available for purchase as well. 75955 Hogwarts Express is instock and ready for immediate shipment too. Thanks to forum member tremere for the tip.
LEGO Harry Potter Wizarding World sets are now available for purchase for those living in America! Currently, there are four sets available for purchase. There's also a pair of LEGO BrickHeadz containing Ron Weasley and Albus Dumbledore as well. Right now, you can get double VIP Points and a free LEGO Tote bag with purchases above $199 too! Shop Now: US | Canada | UK
*Note that these sets don't appear to be available yet for purchase in Canada or the UK.
Article Link: http://toysnbricks.com/lego-harry-potter-wizarding-world-sets-now-available/