GameXplain: What we want in Pikmin 4

[Kotastic]

Have the time mechanic mean something (adds adrenaline for me)
Bring back tunnels in some way
Somehow merge the previous Pikmins into one. There comes a point that there would be too many pikmin, and I would like to see some of them merged.
Mooree challenges
Stay true to the Pikmin formula :D