Anyone played Star War Republic Commando, Serious Sam 2, and half life 2 series??

I have a few questions on these games??
First: Star war republic commando

This was such a great game, but why there is no sequel to this game? Was there any announcement said that sequel has been canceled or what??. Idk because i was only 9 or 10 and i didnt even know English that much back then..

Second: Serious Sam 2

Again this is another great game, i remembered playing this all ***ing day just like ^ when i had no internet. At some points laters, i already knew a lot more english and had internet, so i started going online and reading video games' news.... And i heard they were going to make serious sam 3, but u no it been 5 years since serious sam 2 came out and nothing , no serious sam 3. anyone knows what happened to it, did they cancel it??

Lastly, im talking about half life 2 episode 3

This game is getting on my nerves because episode 1 and 2 were awesome, but it been 2 years already since episode 2 came out. Is Valve still working on this game people? i havent heard anything about this game. OMG DONT CANCEL IT>>