I am the founder/developer of remastersys.
Remastersys is alive and well. In fact I've been in talks with Clem and Ikey to add support for LMDE to remastersys officially and that should be coming very soon.
I just released 3.0.2 that supports Ubuntu 12.04.
The rumour that remastersys was dead was started by the person who started relinux(which was started by forking remastersys except he removed my copyright from it - this has since been corrected after I finally convinced him that he was in violation of the GPL). I did briefly kind of give up on it but managed to find the time to continue especially since there seemed to be a smear campaign against remastersys by the competing fork.
The fork now seems to have gone idle after only a few months of development form what I can tell. Remastersys has been around since 2007 and it keeps on going. Sure there are times when things slow down but part of that is because there aren't many changes to casper or ubiquity(the live and install tools from Ubuntu) so there is no need to change anything if it is working. The debian version only gets updated if there are bugs or when new debian stable versions come out. I am kind of changing things around for the debian version to support wheezy before it goes stable too which will in turn help support LMDE.
I'm also not one to add every little request that comes in since I try to keep remastersys generic enough to suit all the different desktop environments and flavours of Ubuntu and the derivatives but encourage folks to modify it for themselves as they see fit. All I ask is that the copyright and GPL be honoured and adhered to.
I am around on this forum(rarely though), the ubuntu forums in the Community Cafe and my own forum - http://www.remastersys.com/forums/
If you post something here regarding remastersys and I don't see it or respond to it within a day, please send me a PM and I'll answer it. I make a serious effort to respond to every message and request for help and always have but sometimes I'm not notified of them.