Well you would hope that the guys at Valve have been doing something for the last couple of years as opposed to just churning out hats.
It would seem that there is growing hype surrounding two events coming up in the next couple of weeks:
1) GDC 2015 - GLNext Conference (March 5th), lots of hype surrounding an unknown/not labelled item in the SteamDB. Owners of SteamDB say it's not HL3 but it does suggest that Valve have something to present.
2) Chet Faliszek talking at EGZ Rezzed 2015 (13th March), speculation around what he's going to be talking about as all over speakers have a documented topic. Chet does not...
Sacks of salt, speculation, tin foil, dreaming etc. here:
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I'm going with common opinion that it's Source 2 as a starter, and then possibly a game to showcase it. My money is on L4D3.
Either way, it's always good to have some noise and hopefully some announcements coming from a great developer.

It would seem that there is growing hype surrounding two events coming up in the next couple of weeks:
1) GDC 2015 - GLNext Conference (March 5th), lots of hype surrounding an unknown/not labelled item in the SteamDB. Owners of SteamDB say it's not HL3 but it does suggest that Valve have something to present.
2) Chet Faliszek talking at EGZ Rezzed 2015 (13th March), speculation around what he's going to be talking about as all over speakers have a documented topic. Chet does not...
Sacks of salt, speculation, tin foil, dreaming etc. here:
-
I'm going with common opinion that it's Source 2 as a starter, and then possibly a game to showcase it. My money is on L4D3.
Either way, it's always good to have some noise and hopefully some announcements coming from a great developer.