All numbers are up for debate and I would love input on all or any of them.

Stolen

Total funds stolen has been confirmed as 119,756btc

https://www.reddit.com/r/BitcoinMarkets/comments/4vtv1m/bitfinex_down_due_to_bitcoin_security_breach/d61ofzt

Funds remaining

This is where things get interesting

BTC

It is believed that at least this acount is still in Bitfinex's controll, totaling 33,388btc

source

https://www.reddit.com/r/BitcoinMarkets/comments/4vtv1m/bitfinex_down_due_to_bitcoin_security_breach/d61p33i

ETH

This account with 999,910ETH is marked as a bitfinex account.

USD

Now using info from BFX we know that Bitfinex is lending out about 38,000,000 USD, and therefore in controll of it. but there is likely more. So to estimate that I am going to look again at the 1 mil ETH.

From the same site BFX we can see that about 500,000 ETH is loaned out. assuming a similar ratio I am making an assumption that there is 76,000,000 USD in Bitfinex's control.

ETC

No clue, lets say 50% of the amount of ETH?? 500,000 ETC

LTC

From 2x of the loans out number, 70,000 LTC

Total Assets Remaining

Numbers at current prices

BTC: 550 ETH: 9.45 ETC: 2.83 LTC: 3.65

Please check my numbers but I get 105,483,049.5 USD or 191,787.4 BTC

Refund possibilities

If the losses are socialized this would mean a haircut of 38.44% or in other words a return of 61.56% of your money.

But socialized the losses may not happen, due to each user having an unique account address it could be argued legally that accounts with money eg USD,ETH can not be sold to cover losses of other accounts, this will be up to the lawyers. If only the remaining BTC is used to refund the haircut will be 78.2% returning 21.8% of the funds.

Edit: 1

A lot of reports from users that can see some of their account balance, by looking at there addresses directly, that they still have btc in these accounts. I don't see anyway to make an educated guess on the total of these balances so I will not edit the post to include them.

Edit 2

/u/zanetackett on reddit is updating all day (same message) no plan on refunds, site back online, probably read only, today, more detailed announcement sometime today.

Edit 3

I should've made clear I think these numbers are the minimum Bitfinex hold, but I need to emphasize 'think' with a capital 'maybe'