In broadcast TV, network "up fronts" preview new fall shows. By mid-winter, networks revamp their lineups. An alternative: drop in a blockbuster such as American Idol. Hyundai and its Kia affiliate offer their own twists on TV land practices. Hyundai was out first with its well-received Sonata. Now, it's Kia's time in the limelight. Each carryover nameplate snatches a newer, upscale