I know there has been a lot of speculation about vol. 5 of Aria, so when I got this news I figured I’d pass it along right away: Tokyopop marketing director Marco Pavia e-mailed me today to let me know that vol. 5 of Aria will be out in November, and vol. 8 of Tactics, another former ADV title, is scheduled for a January 2010 release. Marco says
As you may recall, sales of these two series had been slow as the challenges of the economy grew, so we had adjusted the release frequency of these and a few other series earlier in the year. It looks like demand has picked up, so I hope everyone enjoys—and buys—these new volumes.
So yes, fan demand does make a difference!
UPDATE: Johanna’s post, linked above, lists a number of Tokyopop manga that were cancelled from Previews, and Marco just pointed out that a number of them—VB Rose, Elemental Gelade, Jyu Oh Sei—are back on the schedule. So the question of whether books are being cancelled or postponed seems to be answered, at least for some titles.