Yes, I know have posted this before, but since we have these sub-forums I thought this topic would be better off in here.
I think 12's battle system would work perfectly for 14, it's basically an auto-attack system combined with the Active Battle System from the original FF series. Auto-attack is what most people want and it isn't as slow as 11's auto-attack system, which I like, so adding it would a big boost the battle system. Also with the inclusion of target lines and the target circle around the enemy, party leaders can show which enemy they're attacking without using the battle icons. With this addition, the battle system is less complicated and need to go through a bunch of menus is lessened. Of course, there should be an option to toggle this off and on.
In 12 there were battle chains which increase loot drops, but in 14 this could be used for EXP/SP instead. For example for every 10 chains, your EXP/SP rate increases 2 percentage points and this chain would only go up to 100. The EXP/SP chain would grinding more bearable for most people, also people would see this as getting rewarded for playing the game. Also since we're getting instanced dungeons, traps can be added. Traps in 12 added surprise and made gameplay more challenging. These traps could pave the way for more skills to be added in 14, like skills to detect traps or allow for more challenging dungeons for hardcore players to be created.
The Zodiac Job System should be implemented in some form, this system worked in designating specific roles for the characters. For those who don't know what Zodiac Job System is, read about it here. Obviously would we have the choice to switch between jobs unlike the Zodiac Job System, but I think having a system where people can gather points to learn to do something then go to a shop to buy a magic spell or weapon is more challenging and rewarding to players.
To me the music of 12 had a grand MMO feel. I like Uematsu-san's music a lot in 14, but I think Hitoshi Sakimoto's style would fit Eoreza better. In any case I should Sakimoto-san should contribute in some way in the future.
In conclusion, there are other things in 12 that could probably work in 14 that I didn't list here, hopefully other forum users can list those. I wanted you (the developers) to look at another game besides FFXI for ideas. I see 12 as an improvement of the 11 system and I think those improvements should be brought to 14.
Thank you for reading.