Andor said:That is a good point. There is no particular reason that all power soures should supply all roles. Source/Role symmetry is a false goal.
Exactly. It looks like we will have an arcane class for all roles eventually (with Bard as the Leader and Swordmage as the Defender), but WotC's said a Martial Controller is rather problematic, and I'm not exactly sure what a Divine Striker would be (a Divine Controller as some pure-caster priest variant might work). So I suspect at least initially, new power sources (at least from WotC) will get two or three classes that seem iconic, rather than a full slate of four (which nothing gets in PH1).