Usually it's Tuesdays and Thursdays. Sometimes more.

I'm hoping for the Walking Dead or Sam and Max

You mean the classic one? Because Telltale Games Sam and Max games are already here.

...Grim Fandango please?

I believe the word is wololo !

Someone told me Conquest Frontier Wars was coming out later this month. Does that already have a number assigned to it?

I stand corrected!

But it would be also awesome awesome if Majesty Gold HD is released. But this time I know better - the proper phrase would be "I'm meeelting!" (out of excitement of course ;)

^^^
This. :\ Soooo many of them.

Slipstream 5000!

My opinion is that the 500th game will be delayed, since when TET was responding saying that the 500th game would be sometime in January, and that they have something special planned, they weren't aware of XIII being removed from the catalogue. Thus if they keep the scheduled release schedule, the special game would be the 499th. Thus the game will be released later on, but I don't want to make any assumptions on what it will be.

Big Rigs.
Seriously though, I hope its System Shock 1 or 2.
If not, then maybe grim fandango.

Blade Runner

Pegasus Prime HD. I know it's still in beta, and GOG wouldn't release a Mac exclusive, but Pegasus Prime HD.

Maniac Mansion!