as a fan of fallout 3 and some aspects of fallout new vegas i am craving fallout 4... so is it coming soon or have bethesda abandoned the fallout series?

Bethesda just released Skyrim and is working on it's DLC's.
So no, it's not coming soon, and no, they have not left the Fallout series.

http://www.gamesas.com/topic/1432447-fallout-4-speculation-suggestions-and-ideas-thread-100/