Pelipper Lead
Pelipper doesn't really bring anything to your team by being deployed in the lead slot. Also, losing to LeadCham is a Bad Thing because you basically hold up a white flag saying, 'Please, ravage my team and make holes for your sweepers'. However, STAB Surf combined with good Defense gives it a niche in a metagame where almost every lead is physical and many are weak to Water.
Dodrio
Dodrio takes advantage of the scarcity of Rock-types (Golem/Rhydon are nowhere, Relicanth doesn't have enough power and is commonly used as a lead anyway and Cradily doesn't resist Flying).
I've been testing Dodrio a little and I've found it to be extremely potent. It's basically, '2HKO their Normal resist/physical wall with Brave Bird, switch out, clean up with Return late-game'.
It helps a lot if you have a strong core to switch into would-be revenge-killers. Magneton is a fantastic partner, resisting Rock, Ice and Electric while Dodrio can get a rare free switch-in on Ground attacks in return. Maggie also Subs easily on Miltank, which is one of the few pokes that can capably wall Dodrio. Another good poke to pair with it is Scarf Primeape, which easily cleans up once physically bulky pokemon are gone and can threaten Rock- and Steel-types with its powerful Close Combat. Medicham is really useful in the same vein - it can bring in potential revenge-killers to be damaged and blows holes in physical walls to help Primeape and Dodrio.
A bulky Ground-type like Quagsire or Gligar can also help - Dodrio comes in on Grass moves while Quagsire resists Rock and is immune to Electric as well as being able to switch into Skuntank and Scarf Primeape.
There's definitely the potential for a really good team here - if anyone wanted to test it I'd be interested to see the results.
UU Stats:
Regirock dropping down would be ridiculous. By the look of things, though, that's quite unlikely to happen.
Hitmonlee looks reasonably likely to drop, though in April I think its usage has gone up - if it does drop it will be extremely threatening and Fighting HO is going to get a lot better.
Nidoking and Nidoqueen both look almost certain to drop, especially the latter. They will find a much less favourable metagame than the one they left - Espeon is a real threat to both and they are walled by Slowking. With Skuntank usage up, T-Spikes are not as good any more either.
Drifblim is going to change the metagame. A lot. Not much can stop the ChestoRest set once it gets going, SubPetaya is incredibly dangerous and the leadBlim has quite a few good matchups right now.