I'd love to get the book, but had a nasty shock when I went to Steam to buy the basic game and pdf. For some reason they are more expensive because I'm in the UK. There is a 25% discount until 10:00 am PT 5th May, so when I first went in it looked like I could get the game for $29.99 and the book for an additional $9.99, so $39.98 combined, or £26.41. However, once I logged in and the site knew I was in the UK the price was "adjusted" into UK currency, but the prices were now £26.41 just for the game, and an additional £9.99 for the pdf, a total of £36.40, or $55.10.
I was ambivalent to the game before, but now I'll wait and see if I can get the pdf through Battleshop or DrivethruRPG.