While preparing for game night I came across some extra 5th edition monster stats posted on the wizards site. they are from October / August of last year but good enough for expanding on some encounters.

Legacy of the Crystal Shard http://www.wizards.com/dnd/Product.aspx?x=dnd/products/dndacc/sundering2

Murder in Baldur's Gate http://www.wizards.com/dnd/Product.aspx?x=dnd/products/dndacc/45370000