From Serebii.net. Giratina, New Normal Stages, New EX Stages (Kalos Starters)
Details of the next event have been revealed.This event gives you access to the Pokémon Giratina and runs from Monday June 8th to June 22nd. This stage is the first in what is called an Escalation Battle. Each time you complete the stage, it levels up and becomes more complicated with added obstacles such as four columns of frozen blocks at Level 40 or instant disruption at Level 10. When you reach Level 5, you get 1,000 coins and when you get to Level 50, you get a Disruption Delay item. The likelihood for capture also increases as the stage's level gets higher
--> 50 LEVELS ? At least 50 HEARTS ? OMG :D I hope the first levels are easy ! Disruption Delay for level 50 is LOL !
It has also been announced that new stages are to come to Pokémon Shuffle on Monday. These continue the Pedra Valley stages and include Garbodor in 194, Doublade in 195 and Conkeldurr in stage 198. Three new Expert stages are also being added, focusing on the Kalos starter Pokémon, Chesnaught, Delphox and Greninja. We'll bring full details of these stages on Monday
I think it will have more levels than only 3 normal stages ! Yay for starters