A medieval historical figures line, you say? That sounds interesting, though I doubt LEGO would do it... But come on, can't you use your imagination? Where's the fun of making a minifig character if it's already determined exactly what it's supposed to look like? And isn't the forest man from the upcoming line a Robin Hood of sorts already?
So no, I don't think it would be a good idea if LEGO starts making historical people. I'd rather see more original LEGO characters with original names, instead.
Oh, and if they ever make a brown bear mold (which I REALLY
hope they do!), how about an impulse/collectible set with a tamed bear (looking exactly like a wild one) and its master (a bear trainer)? Or even better, just the bear, a fish, and some little piece of dirt? Now that would be just fun-tastic!