Ok, I had been working on the wiki for 5 hours straight...My head's spinning, but I'm going to give you a summmary of the update, so here it is!
1. Spring Event 2015 Start
Operation No.11 Spring event will start after the current maintenance
This event will be 20 days in length
2. The main operation will consist of four operations areas
1st map: Preparation for Operation No.11
2nd map: Second Curry Ocean Operation
3rd map: Bagel Bay Transport Destruction Battle
4th map: Final Battle! Ri Lanka Island Invasion
3. New Kanmusu
In the main operation area, you will be able to encounter three new kanmusu
Finishing Operation area 2 will reward you Unryu type carrier, Katsuragi
Finishing Operation area 4 will reward you the kanmusu from the west, Littorio.
4. New kanmusu 2
In addition to the two in the previous note, Yugumo type DD Takanami can be encountered
* Can be encountered as a drop in the later maps of the main operation
* Drop rates will differ among different areas
05. New system
Until now, Kancolle's map branching was based on fleet composition and randomness but today's update will add the ability to choose direction in certain maps at certain points.
6. Combined Fleet
2nd Curry Ocean and Rilanka Island Invasion (E-2 and E-4) will require a sortie with combined fleet.
7. Support fleets
The ability to send out support fleets for your fleet and combined fleet will be available again.
Both normal and boss supports can be sent.
8. Extra Operations
By finishing the main operation, Extra Operations are unlocked.
There will be two maps where very strong Abyssals have regrouped.
9. New Kanmusu 3
You will be able to encounter the new foreign Kanmusu Roma in the final operation area (E-6)
10. New Kanmusu 4
Finishing the Spring even will reward you with the 2 year anniversary kanmusu, Seaplane Tender Akitsushima
5 new kanmusu will be available this event
11. Difficulty
Three difficulty levels can be chosen in this event
All teitoku can choose Hei/Easy
Experienced teitoku will be able to choose the harder Otsu/Normal and Kou/Hard modes
12. Conserving fleet strength for Kou/Otsu difficulty
In certain areas, sortied kanmusu will receive a lock and not be able to sortie in other areas
E-3, E-4, and E-5 are these areas
13. New BGM
Spring event main operation area will feature BGM 'Mutsuki type Destroyer's Battle'
The combined fleet will feature 'Go west, Combined Fleet'
The EO areas will feature BGM based on the Abyssals
14. New Equipment
Type 2 Flying Boat, 381mm/50 Triple Gun Kai, OTO 152mm Triple Secondary Gun, 90mm Single HA gun and the Pugliese anti-torpedo system will be implemented
15. Type 2 Flying Boat
This new equipment can be obtained by refitting Akitsushima
It will also be a reward for finishing one of the later operation areas on kou/otsu.

And with that, the Spring 2015 event has begun
Order! Operation 11 has now started!Our wiki would like you to help collect information for the drop list. So we are providing you a form to fill out as you play the event map. Your participation will be most helpful as we all participate in the event.
https://docs.google.com/forms/d/1sBEls7IGYifi6lXjp2FGUz_j3zQOzOrBjQZ48RKTifQ/viewform?c=0&w=1Also as for me, I will be streaming the event every night starting from 12:30 AM - 2 or 3 AM The objective is simple... hardcore mode... No ifs no ands, no butts... this even include for hunting
Roma... who will probably be the hardest to earn from this event as she is a
random E-6 Drop! So please feel free to come to my stream each night.
http://www.livestream.com/totakuI will upload information on bosses and Kanmusus later on since this is an event. So I'll be introducing them as I move along the event. Remember kids, the good prizes come if you take on the harder levels, but also remember fleet locking will occur from E-3 and up! Unless you play Easy.... which it doesn't happen at all! So plan accordingly!