If the promo Paypal has been sending out is correct the Steam Summer Sale starts at 1:00PM ET today. I got the same email from Paypal last year a couple weeks before the sale and it was right so I expect it to be right again this year. Here are some of the games I'm targeting if the price is right.
Dying Light
Shovel Knight
Wolfenstein: The Old Blood
Ori and the Blind Forrest
The Talos Principle
This War of Mine
Wasteland 2
GTA V
Divinity Original Sin
There are lots of other games on my wishlist but since I already own so many games I want to play I won't be buying them unless they are a great deal. Even the games I listed would have to be at 50% or more before I would pull the trigger. At least, that's what I'm saying now. I have been known to make impulse purchases in the past.