Hmm...
1) How exactly didi Ari marmell design the stuff if he does not have the rules yet? (since the rules have yet to be released even to freelancers who pay the $5000)
2)I really think you have jumped the gun on this; not due ot the gamble you took but due to posting your players guide here. I think it would be prudent to wait abit and read the OGl before announcing anywhere else.
3)I seriously doubt WOTC will alow anyone to fill the gap for barbarian/druid et al. Especially since the Ogl now requires the PHB even for 3rd party products; I think designing new classes might be not as..open as before.
4)Look forward to the frer adventure.

I enjoyed the wizards amulet, even though I am not really in krawls at all; perhaps this time it will be a Warlock who will have need of ocmpanions and will be plagued by a haggidy old wizard seeking to steal his 'new' type of magic.
Regards and best of luck with your company and 4E!