Trail from WP Parking Lot to summit : all clear, no snow patches and low water crossing.
Water Source: a lot of water source all the way from Whitney trail to Trail Camp and no water source after that all the way to summit.
Cable: icy but on the sides, very managable with trekking pole when I was there. Use your own judgement and base on your comfort zone when planning to go up there.
Switchbacks: all I could say is, Mt. Whitney, land of switchbacks from parking lot to summit and it feels like they added more on the way down 😂