How many fallout games will there be?

has anyone heard anything about this topic?
fallout

fall out 2

fallout tactics

fall out 3

fallout 3 expansion pack whose name elludes me

and fallout new vegas



knowing bethesda they only release 2 expansion packs for each game there wont be any fallout 3 content after this

fallout 4 perhaps after tes 5
well there was fallout fallout 2 those were both for pc than of course fallout 3 and fall of 2010 will come fallout new vegas thats all i know
Fallout

Fallout 2

Fallout 3

Fallout: New Vegas - http://www.amazon.com/gp/product/B003JBH

Fallout 4



http://en.wikipedia.org/wiki/Fallout_(
Fallout,Fallout2,(fallout 3 tech demo,game was canceled,but tech demo is leeked out to internet)

( made by first company )

fallout 3 expansion pakcs,fallout new vegas ( is coming soon )

if new vegas will be good im sure there will come more.