I agree with adding the 'Orb of...' line of spells, it would create a nice equality across the elements for the mid-levels. Of course, if they follow the PM blasting template, then I suspect the level 12 spell-like ability will be a single target ranged attack, which is basically the orb line.
I suspect the two new spells will be a 9th level equivalent to meteor swarm, although I'm sad that they didn't make a new acid one and instead said, "Here, borrow meteor swarm." They could add higher level of vitriolic sphere from the spell compendium for example, up front damage with the DoT acid users love.
Any word on acid DoT stacking Eladrin?