The price of KMD looks much better than the attack before, I guess that people think KMD team is competent to handle all the messes, therefore KMD is rising.
There is still no way to transfer coins to bittrex. I dont think the price is reflecting the real value.
Why is the wallet on Bittrex under maintainance?
Wallet is under maintenance simply because full implementation of fixed or rolled back chain is not yet being done. Sure Bittrex was not affected by the exploit because of a bug but they are making sure that no bogus KMD tokens will be able to mix it out with the legitimate ones in their exchange.