Pleasures of the Damned was not the last posthumous collection, Portions from a Wine-Stained Notebook came out in 2008. If you're talking strictly about poetry, there is another "new" collection of old poems coming out from Ecco this year.
Hmmm; I thought I was staying up on these things better. I know that City Lights plans another volume of mostly prose, probably in 2010, but I didn't realize that ecco had another in the pipeline.
Good news though!
As for zenguru's point, and I know that mjp has mentioned this before; but it's interesting that At Terror Street... has never been reprinted. I think that a companion volume to Burning in Water would be a great idea; include all the poems from It Catches, Crucifix and At Terror Street... that didn't get selected for Burning... Of course, if you own these older volumes, it's nice to have poems that aren't readily available elsewhere.
I do not know when Ecco plans to publish the new poetry collection. I know it is going to be mainly - if not exclusively - older work. Things like I saw a tramp last night. Stuff from old magazines that Martin didn't have available to choose from back in the day, or older magazines that Bukowski didn't have a copy of, or overlooked.
It is expected to be rather thin - think Days Run Away or Play the Piano size. It won't be 400 pages like the later collections. At least that was the plan. Who knows, maybe they will pad it out with a bunch of reprinted filler before they publish it, to justify the $30 they'll no doubt charge. ;)