State of each window will be kept as FS metadata, and the entire state (which windows are open, pointing to what folders etc.) are kept as the “workspace”.
Well, that sounds ideal and should fulfill my spatial desires it seems. I'll just go back to my old routine and launch my files from the finder.
You probably will be able to get closer to your spatial desires -- but making cmd-T work on all windows, and the folders they point to, seems like a wrong choice -- for that, you should maybe use Spotlight.
How will command+t work then? Go through all tabs in a window? I just found command+t rather useful, but there is no real problem if it's not there, I'll gladly sacrifice it for spatiality :)
Andreas