The mysterious page looks like the announcement or release page for the Steam Family Share Plan. Based on the circles with the 0 + 0 and the cat at the bottom of the screen.
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My guess for one of the announcement will be CS:Source 2 to use the new Source 2 engine.
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Monday = Monday-ish according to valve time so that seems reasonable :)
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Valve partnership with Dewritos, Steam closing down, Valve games only available for Xbox One
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Steam Collecting Stamps.
Steam Newgrounds.
Portal 2 keys and crates.
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All theses guesses, but I'm afraid that 90% of them won't come true.
The page clearly states that these will involve bringing steam to your living room. Poor users are immediately dropped out, because not everyone has HD TVs capable of such.
If these announcements will be nothing else, then I don't care personally.
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"We have three announcements to make beginning with the first one on Monday morning." (Not sure if they are all next week or not. It isn't very specific.)
-Steam Box.
-Left for Dead 3
-Half Life 3(/Half Life 2 Episode 3)
That's my guess. They already announced source 2 kinda, though I guess that could be an announcement as well.
He has to be he know's he teasing people by saying the number 3.
EDIT: Mysterious page.
Also would like to add. If you didn't know already L4D3 was leaked a few months ago. (Just a little bit of code.) From a valve tour. However it hasn't been announced yet. (Other stuff was leaked before that too I recall, but can't remember it.)
And Source 2 was "announced" awhile back too.
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