Are these concept arts from Valve's 'Year 2008' plans of Half Life 2: Episode Three?

DSOGaming writes: "Now here is something interesting for speculation. The FB page of ValveTime.net (main site is currently down mind you so you won't be able to access it) has posted some concept arts of Half Life 2: Episode Three. It is said that those concept arts are leaked from year 2008 and as we can see, they definitely have a Half Life feel to it."

[john2]

Steam moderators confirmed those as real concept arts. That's a good thing, though I doubt it's the start of HL2:E3's hype machine

[ninjahunter]

Im going to lead towards a naw, some of it resembles Half life to me, but theres enough that doesnt to convince me otherwise.

[Jio]

What I like about Valve is that they take their time and always come out with a good product. It's obvious HL3 is coming, but Valve has been working hard to make it the best FPS ever.

[aliengmr]

My money says HL3 will debut with Source 2. Source is a great engine but its starting to show its age.