New Vega classic stage, balance change updates, return of the Thailand stage, coming to Street Fighter 5 on May 30th
For starters, another classic Street Fighter 2 stage is entering the mix. Players will be able to pick up Vega's classic Spain stage complete with the cage in the background.
Now called "Flamenco Tavern," players can acquire this stage for $3.99 / ¥400 / €3.99 or 70,000 Fight Money. Vega players will be able to climb the cage, just like in Street Fighter 2. Additionally, the classic Thailand stage will become available again with the updated background music for $3.99 / ¥400 / €3.99 or 70,000 Fight Money.

Additional balance changes
Balrog
Turn Punch
① Level 1 - 6 Motion: Added throw invincibility for frames 1-18F.
② Level 1 - 3 Motion: Changed to upper body and projectile invincibility from frames 3-18F.
③ Level 4 - 6 Motion: Changed to attack and projectile invincibility from frames 3-18F.
④ Level 7 - 10 (Final) Motion: Changed to complete invincibility from frames 1-18F
R.Mika
Passion Press
Hitbox was reduced
Dhalsim
Stand Heavy Punch
Changed the total frames from 44F ⇒ 42F
Back Throw
Reduced the distance from the opponent after hit.
Each monthly challenge will only be available for the month it's tied to, so one the first of the next month rolls around you won't be able to complete it any more.
Here's the challenge breakdown. The latest Unity blog notes that anyone who signs into the new CFN between May 30th and June 13th (PST) will be rewarded with a 50,000 Fight Money bonus. So, if you're looking to pick up Season 2's latest DLC character, this bonus will get you halfway there.
Ed will be available for purchase on May 30th for $5.99 or 100,000 FM.
Source: Capcom Unity. Sent in by battlemon, shinwar, BLACK_PHOENIX3, cuzzo, and cris25.