What is the most current edition-dsm iv or dsm iv-tr?

The DSM IV Diagnostic manual was first published in 1994. The DSM IV - TR is a text revision published in 2000. So the most current edition is indeed the DSM IV - TR. The DSM V is due in 2012 and may be very different from the current style.

See http://www.psych.org/mainmenu/research/dsmiv/dsmivtr.aspx for more info.