User blog comment:Tdiandrockmusic2/New Year's Baby!/@comment-237406-20100101124003

"leaving it unknown if Zak and TDI19 will ever return. "

TDI19 said a couple months ago he'll be back soon.

Zak actually recently edited when Sunshine messaged him, but other than that he's basically gone, presumably due to tensions on the TDI wiki (even though I'm the only one here who goes there a lot).