Merkava 5 in South Lebanon?

I came across a blog:

http://peace4palestine-housewife4palestine.blogspot.com/2006/08/israeli-merkava-tanks-fail-to-rise-to.html ( The page was taken down yesterday, some people just can't be shown to be wrong. )

It insisted that Israel used Merkava 2, 3 & 5s in South Lebanon recently.

Wrong! There is no such thing as a Merkava 5. The Merkava Mk4 is latest development.

Do a web search for Merkava 5, you will get some results. But there is no proof of it's existence. It appears that a Merkava 5 may have been in development, dropped for budget reasons in 2004. But this is not verifiable!

No Merkava 5 has ever been produced, nor is there any available drawings to indicate any development.

References:

http://www1.idf.il/DOVER/site/mainpage.asp?sl=EN&id=6&clr=1&subject=22961&bScope=false

http://www.acpr.org.il/English-Nativ/04-issue/fishbein-4.htm