Fluff-heavy planar material that doesn't use the core PoL planes, or the redefined nature of many planar creatures (doesn't have to be a reversion to prior ideas either, as I could strip-mine ideas and concepts happily from products that go their own, different route entirely). I wouldn't mind working on a
4e planar product (ruleset and mechanics are often pretty superfluous to me) so long as I wasn't constrained to some of the assumptions the default PoL rather strictly defines.
Of course, I'm not sure how far the
GSL would allow you to stray from how
4e defined some planar creatures (above and beyond those which aren't open content to use at all).
And yet another word from our sponsors
