"Evolution never stops. As the World Cup showed, 4‑2‑3‑1 has come to replace 4‑4‑2 as the universal default (18 of the 32 teams played some form of 4‑2‑3‑1 at some stage, with another three fielding a 4‑4‑2 that perhaps should have become 4‑2‑3‑1) so the system at the very highest level has already begun to mutate. Spain, by the end of the World Cup, had followed what Barcelona did at times last season, what Arsenal seemed to be reaching towards, and set up in a 4‑2‑1‑3.
Now clearly the distinction between 4‑2‑3‑1 and 4‑2‑1‑3 is minimal. It entails nothing more than the central player in the trident pulling a little deeper and the two wide players advancing slightly. In practice, as the wide players look to escape the attentions of full-backs, their depth of position may not alter greatly, but to refer to the system as 4‑2‑1‑2‑1 and start introducing a fifth band is probably to begin to confuse the simplicity that gives value to the practice of assigning numerical codes. The shape, if anything, resembles a diamond sitting on a plinth. As I've said before, the designations are of course crude, but they have a use in providing a broad explicatory template.
The key differences in the formations
Yet it is significant if that central creator plays deeper, for a whole number of reasons. To begin with, if the playmaker operates close to the holding pair, the team cannot be "broken" into attacking and defensive sections as Holland and Argentina were at the World Cup (which is an advantage for those sides that believe in a possession-based approach). By definition, by being only a short pass away from the creator, the two midfield holders are more involved in the attacking aspect and at least one of them can be encouraged to press forwards at times, as Xabi Alonso did for Spain, and as Seydou Keita does for Barcelona. So immediately the range of attacking options is increased.
There is also an impact on the creator himself. Playing a touch deeper offers him three advantages. He is nearer the two holding players, who can be considered his protectors, which makes it harder physically to intimidate him, while his more withdrawn position means he is farther from the opposing holding midfielders, harder to pick up and thus likely to have more time on the ball (not that Xavi or Cesc Fábregas really needs more time on the ball; one of the joys of watching Spain or Barcelona recently, or Holland or West Germany of the 70s, is their willingness to give the ball to a man under pressure, trusting his technique to release it and change the angle of attack).
The creator is also more likely to receive the ball facing goal – or at least to have time to turn so he is facing goal – with three team-mates ahead of him (as opposed to one ahead and two alongside) and the potential of others breaking from deep, and so he becomes something more like an old-fashioned playmaker than a second striker who tends to receive the ball with his back to goal. That, in theory, should make the transfer of ball from back to front quicker and thus make a side more penetrative."
Now reading from an unlike source wikipedia it says;
"The somewhat unconventional 4–2–1–3 formation was developed by José Mourinho during his time at Inter Milan including in the 2010 UEFA Champions League Final. By using captain Javier Zanetti and Esteban Cambiasso in holding midfield positions, he was able to push more players to attack. Wesley Sneijder filled the Trequartista role and the front three operated as three strikers, rather than having a striker and one player on each wing. Using this formation, Mourinho won The Treble with Inter in only his second season in charge of the club. Currently, under Mano Menezes management, the Brazil national football team uses this formation.
As the system becomes more developed and flexible, small groups can be identified to work together in more efficient ways by giving them more specific and different roles within the same lines, and numbers like 4-2-1-3, 4-1-2-3 and even 4-2-2-2 occur."
I heard teams such Arsenal, Man City, Spain the question is the 4-2-1-3 really the future of football and can it work on FM 12
Straight away there are 2 variants of the 4-2-1-3

Mourinho version

Arsenal/Spain version
I wont be telling people how to set it role by role because to me thats a personal thing. One thing I did notice it is versatile. If your a Proactive and like to plan ahead youshould be able tweak it to expose oppositions weakness without effecting familiarity.

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