"Two and a Half Men" was not listed among the 14 programs renewed by CBS on 3/27/13 for a 2013-14 season.

CBS said in a statement that they are in discussion with Warner Bros. Television regarding another season (11) for "Two and a Half Men".

http://www.huffingtonpost.com/2013/03/27/elementary-renewed-season-2-cbs_n_2965937.html?

Doesn't sound very positive.

Is there by any chance "Two and a Half Men" will be joining the "11 Club"?

The "11 Club" refers to sitcoms who have ended after 11 seasons. Some of them include:

The Danny Thomas Show
M*A*S*H
Happy Days
The Jeffersons
Cheers
Married... With Children
Frasier