I gotta say If you were keeping your fingers crossed for something new from Valve at this year's E3, you can uncross them, as studio boss, Gabe Newell has declared that they'll only be showing games that have already been announced. So, you can forget seeing anything about Half Life 3 or anything else Valve-related for that matter.
"We are not announcing anything at E3. Really," reads a reported email exchange between Newell and a ValveTime.net forum member. "We are not announcing Half-Life 3 or Portal 3 or Left 4 Dead 3. We are going to be showing stuff everyone already knows about (CS:Go [Counterstrike: Global Offensive], Dota 2, 10' UI [Steam 'Big Picture Mode'])."
So, while Valve will be in attendance at E3 2012 this June, don't get your hopes up for any new announcements. Unless of course, this is all part of an elaborate ruse to throw everyone off the scent. Maybe Half Life 3 really will be announced! Or more likely, maybe not. As always, stay tuned.