Taken from the iRO site.
Today, Tuesday September 30, the Valkyrie server officially takes flight with its Grand Opening!
The Free to access Valkyrie server is now the base International Ragnarok Online server. With Valkyrie`s rates for Experience and Drops set to 100% normal RO values, we welcome all those heroes that may have hung up their adventuring cloak due to monetary issues in making a month to month subscription.
In addition to our Valkyrie server opening, our Premium servers, Chaos, Loki, and Iris, also have received an update today. All Premium servers will enjoy a permanent rates update to 125% Experience and Drops from the normal RO values.
Today marks the begining of a new era for Ragnarok Online, `Thank You` to all of you that have always made RO your home, and `Welcome` to all you who are just starting our your journey with us!
Take Flight in our world!
Gravity Interactive, Inc.
Its also a little different from the "Premium" servers. Heres a list of the changes:
F2P - iRO Wiki
I'll be playing here, haha. Hopefully this will bring back a LOT of old school players and people who wanted to play officials but couldn't pay.