Let's not forget that, despite all the hysteria, Half-life 3 isn't the only missing game Valve seem to have lost. There's Half-life 2: Episode 3, which was was dated and teased but never actually arrived, and a non-Valve Episode 4, titled Return to Ravenholm which was barely maintained before disappearing.
At one point Valve was talking about a new Episode arriving every six or so months, but obviously after Ep 2 that plan fell by the wayside. Several images and pieces of concept art for Episode 3 have leaked over the years (with many sites reporting them erroneously as Half-life 3) but the Arkane developed Episode 4 has always been a little more hidden, with only four screens leaking a couple of years back.
ValveTime, perma-Valve sleuths, have now uncovered some more screens showing a basement/prison setting they hypothesise is under a hospital location previously leaked. These images have come from the portfolio of Robert Wilinski, an ex-environmental artist at Arkane Studios now at Starbreeze (and presumably taken from the now empty 'Arkane Studios 2006-2008' folder on his website).
That time period would have matched the rumoured development window of the instalment, which would have featured a new character returning to Ravenholm (hence the title). The screens don't have that much info but do apparently show the game was running on the Source 2 engine due to the particle effects used. It also interestingly features several children's toys, significant considering Half-life 2's kid free world thanks to a Combine reproductive suppression field.
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