Well if you read one of the new blue posts they state:
"Beacon of Light - We're working on tweaking this spell a bit to make it fit the Paladin's "kit" a bit more... look for the change in an upcoming build."
Now obviously this could mean a lot of things but I'm pretty sure to fit the paladin's "kit" they are going make this a direct heal (affected by illumination) and have the AoE hot effect go on after.
I guess we'll have to wait and see but this does look likely as I can't see what else they could do with Beacon to make it more beneficial to the paladin healing system.
Here's hoping