I know that kraken wanted to help there but is there a chance at all to get something back? If so how much percent?
Where to claim ones damages?
Edit: Nevermind about the "how". I found the email.
Edit2: Besides my question about the chances and the percent i wanted to ask if one choses to be paid in BTC, will the BTC be exchanged from the JPY-Value or the original amount of bitcoin is taken?
The chances to get something back are very good, provided that 1) you establish your claim and 2) your claim amount isn't really small (for claims below JPY1,000, the trustee has said that you will still get the payout, but you might have to come pick up your money - not practical for most people).
We don't know the percentage and it will depend on undetermined factors, such as how many people decide to make their claim. Some have speculated that it might be around 20% based on some public information, but it isn't certain.
All currencies including BTC will be considered in terms of their value in JPY when MtGox went bankrupt. These values will be used to determine your pro rata share of the total remaining assets. If you request a payout in BTC, the amount of BTC you receive would be your pro rata share of JPY converted to BTC at the current market rates.