Blackwind
Explorer
If you're that sure you're going to convert to 4E as soon as it comes out, I'd just go ahead and use all that 3.5 stuff you probably own before it's too late. Did you buy Ptolus? How 'bout Rappan Athuk, WotBS, all those APs, etc? Let your players use all the rules supplements they own: XPH, Bo9S... pull out all the stops. Don't pull any punches and let the dice fall where they may -- sort of a last hurrah for all your 3.5 stuff.
But that doesn't answer your question at all. If you really want to start a new campaign now and then convert when 4E comes out... the best advice I can give you is to read all the previews on D&D Insider.
But that doesn't answer your question at all. If you really want to start a new campaign now and then convert when 4E comes out... the best advice I can give you is to read all the previews on D&D Insider.