I assume fiat balances will be converted to coin on 15th?
If the value of coin is higher on 15th than now the conversion will result in less coin.
This should be compensated by the increase in the 55% that they intimated, but it all seems a bit vague.
Currently for those optiong for a refund timing is quite important...
Fiat USD/RUR/EUR becomes a mixture of coins and USDET tokens valued at $1USD each, those tokens might be tricky to redeem.
You will be able to trade them for USD on the new site at a market driven exchange rate but you won't be able to cash that USD you get for them until the new site owners have a fiat processor to replace Mayzus/OKPAY in the UK who seized the BTC-e accounts, and you jump through the EU AML/KYC compliant verification hoops.
I will probably trade fiat tokens for fiat, then buy crypto with that as I only use fiat as a trading hedge, I have never deposited or withdrawn fiat from BTC-e, never had the need/urge to, but I do have some sitting there atm from past trades.