What the new Arena quest section is: A set of 4 quests that require a total of 4 arena victories and KO 20 10+ foes.
Win 1 Arena Battle - Rewards a Dueling Swords
Win 2 Arena Battle - Rewards 100 Feathers
Win 4 Arena Battle - Rewards 100 Feathers
KO 20 Level 10+ foes - Rewards 1 Orb
With a Arena season taking 7 days, this yields another 1400 feathers and 7 orbs. I'm guessing that this is a fairly significant boost to feathers for quite a few people, especially if you can't get a Bonus Hero in your Arena team. Probably halves the time it'll take to get a bundle of 20K feathers.
The real question is what should be focused upon while we are under the 1/2 stamina cost & 0 stamina cost to equip skills? Oh, and the 10 free Stamina Potions you also get during the Worldwide Launch Celebration.
Currently, I think getting as many of the story quests done for the free orbs and focusing on a team of 4 to get that done. Which will hopefully get a team high enough to farm the 6th level of the training tower or higher.
My impression is coming from the experience of playing Star Trek Timelines from launch to present day and playing FF: Record Keeper for the past year+. Seriously, if you put any time into STT at launch and tried it again right now, it's a far better/more enjoyable experience that obviously still wants all your money. That said, I'm going to keep playing, empty out the stamina catch basin regularly, and see where this ends up. Hoping for more features that just make this experience better. It's light enough for a quick 5 minute session to longer sessions after a fresh hero summoning.
Feathers - As for the 20K feathers for the 4* >> 5*, still to early to say? We're all Tier 1 in the Arena with no idea if higher tiers yield bigger rewards. One would seriously hope so.
Orbs - I hope they go to a daily orb reward system. Basing this thought from FF:RK, where you get about 9 or 10 mythril a week and it's 25 for a 11x equipment pull. A 5 hero summon every 20 days is enough to keep me checking in.
Events - More variety. But I have no idea how they could do this. Puzzle scenarios?
Story - Just finished the 1st section of Chapter 9 Normal, so I have plenty of grinding to go. Is there much that they can work with to add more to the existing "story"? Do we even want more of a story?
EDIT: Anyone see the waking the owl up animations? So cute! Utterly adorable. Also buying orbs... holy cow are those expensive. $39.99 for best value at about 53.32 cents an orb.
I can confirm that the max friends limit is 50. This includes friend requests you have sent out and presumable request people sent you. Currently sitting at 23 friends, 27 friend requests sent out and 1 friend request from someone that I can't accept as it gives me the Reached Max Friends pop-up.