Out of interest, why exactly is there a gap of months between releases of a Japanese game in the USA, and in Europe (especially the UK)
Same game, same language. The only difference is the Region number as far as I can tell
Because the Japanese companies don't have official distributors in Europe to publish the game. Mainly if the company is too small, it's probably not cost-effective for them.
So what ends up happening is very small publishing/distributing houses in Europe but in bids to distribute the game. This can take time. in some situations it can be resolved even before the Japanese release.
Apparently the changes needed to make the game work on European consoles and past certification actually have to be done by the Japanese development studio. This is as the publishing studios in Europe are so small they have no development team to make the changes.
This is where the problem occurs and why games take ages to come out in Europe. The actual changes needed to make the game run on European consoles is very small. The problem arises as the Japanese development teams have already moved onto other projects and can't really be arsed about making the required changes. The European publishing houses don't have the 'power' (due to their size) to force the Japanese devs to hurry up.
Apparently Atlus and Arcs only sent the European versions of P4A to the European publishers in April this year. Considering that the game came out in the US in September last year. P4A was finally released in Europe in May. The European publisher was expecting to have the game released around October to the end of the year, but they had to wait for the Japanese teams that took their time. In the end their were no differences in the EU version. No extra languages or nothing.
Some times the Japanese devs making the changes don't even bother to properly bug test. Take Devil Survivor Overclocked. Came out in the US in August 2011. In the EU it came out at the end of March 2013. The game was full of bugs that were not in the US version. On character creation first names would swap with last names, and the game would always crash when trying to summon a monster.
It really comes down to the bargaining power between the Japanese company and the European distributor. The games don't sell well enough in Europe for the Japanese company to set up their own distributor or sign with a big publisher in Europe. The small distributors competing for the game have no power to speed up the Japanese developers.