I'm going to go out on a limb and guess that very soon we will have an Animorphs Rerelease forum of some sort for newcomers, while the newly-renamed "Classic" will retain all its heated "man, the end is crazy" spoil-y goodness. Good call, couldn't have come up with a better one myself.
I'm just a little curious what the exact rules will be. If I may, I'd like to suggest:
Put up a sticky listing what books are okay for discussion. To start with:
#1-6 -- Tags required.
Not yet re-released -- Embargoed. Don't mention plot details, don't ask what happens; those who have knowledge of Classic must stay well clear of speculation--watch, enjoy, don't contaminate even with hints.
Once a volume has been back in print for a couple (4?) months, tags are no longer required.
I know I automatically click on spoilers, force of habit, and as long as Classic remains open, we can keep juicy plot details like[spoiler]--I told you these things are tempting--[/spoiler]over there and give the new folk a fighting chance.