For Phase 4, films that we are expecting Marvel to do are;
1. Iron Man 4
2. Daredevil
3.Incredible Hulk 2
4. Luke Cage and Iron Fist
5.Possible Spider-Man film
6. Iron Man 5
7.Captain America 4
8.Untiled Avengers 4 film
the villains for the 4th Avengers film are to be the Masters of Evil and since Feige and the rest of the studio have been doing many characters and film plots with such heavily creative changes, they should try being more creative on the team's line up of villains here in the MCU and the leader of the MCU's Masters of Evil should be the Mandarin (the real Mandarin of the Ten Rings who has not debuted yet) and as the leader of the Masters of Evil in MCU Phase 4, the Mandarin will debut in Iron Man 4 and with Iron Man 4 serving as Phase 4's first MCU film, from there after his first battle with Iron Man, the Mandarin should then start making arrangements on having a team of remarkable people for his own cause and in the next wave of films, the Mandarin is to recruit a villain or two in each of them before the 4th Avengers and the Fourth Avengers should also feature the line up of heroes for the MCU's New Avengers and for the Mandarin's Masters of Evil in the MCU, it wouldn't hurt for the name of the team of villains to be refered to in the Marvel Cinematic Universe as the Masters of Order, the Masters of Shadows or the Masters of Vengeance which is kind of like Christopher Nolan having the League of Assassins refered to as the League of Shadows. Mostly it's because "Evil" in the name of the supervillain team wouldn't seem flawless enough for the MCU films that it's too much of a cartoon sounding name plus the motive and goals needs to be something more than just taking over the world as well as everyother villains' intentions in the movies go these day.
And why should the real Mandarin be the leader of the Masters of Evil in the Marvel Cinematic Universe as well as the main villain in Avengers 4? Well other than how big a setback that the twist along with how wrong Feige and his people tried doing the character in a different way and other than the fact that the actual version of the villain is still out there as the real leader of the Ten Rings, it's because Marvel Studios did not have Iron Man 4 mapped out for Phase 3 which leads onto making us wait longer for the movie and the real proper version of the character to happen and because of how powerful the Mandarin is with all different kinds powers stored within each of his rings individually which makes him a much more specific leader of the Masters of Evil than Baron Zemo, the Mandarin is very much more of an Avengers level supervillain than just a hero's standalone villain plus making him the MCU leader of the Masters of Evil in Phase 4 should give the Studio more time to explore more on the villain in the cinematic films and this is the best line up of villains that the MCU has to offer:
Mandarin (Leader)
Kingpin
Scorpion
Mangler
Abomination
Moonstone
Crossbones or Grim Reaper
and now for Phase 5 films to expect
1.Dr.Stange Sequel
2.Ghost Rider Reboot
3.Incredible Hulk 3
4.Iron Man 6
5.Possible Spider-Man sequel
6.Untitled Avengers 5 film
The 5th phase is expected to be the final phase of the Marvel Cinematic Universe and for this phase, the primary villain is to be the Hood, a villain who got his powers from Dormammu and became the leader of a supervillain organization/team named after himself now here is a list of the villains we want for the MCU line up of the Hood
The Hood (Leader)
Deathwatch
Blackout
Ufoes
Shocker
Shockwave
Crusader
Mr. Fear
Living Laser
Grey Gargoyle
Surely we cannot expect all the villains from the comics to join up with the hood in the Marvel Cinematic Universe so this amount of villains will have to do in the mean time please do not expect any of the phase 3 films to tease any Skrulls because the infamous Secret Invasion storyline cannot work in the films without the Fantastic Four since their field commander Super Skrull possesses the ability of all four of them and it would involve a huge amount of heroes and villains for the Skrulls to tries disguising themselves as and it's to overwhelming and too chaotic for the films to handle because afterall, there are other things and characters that we want Marvel to bring out that are more earthbound so unless a Phase 6 happens, don't bother with Secret Invasion. So in the mean time, keep your eyes open for more updates on ups