All of those who are wondering MGO release on bittrex, that what was said from MGO team:
''we are doing our best to get MGO listed on exchanges including Bittrex, but you must keep in mind that it is not ultimately based on our decision. Bittrex is under stress do to the recent SEC ruling and has stated that they are quite busy which has made listing processes slower. We appreciate your support and will continue to work on increasing the liquidity and reach of MobileGo.''
We must start bothering bittrex more

It's too hard for an erc223 token to be listed on an main exchange, dev team has done their work , so yes, let's bother bittrex.

what is the difference between an ERC20 and an ERC223 token ? can someone explain me that in short words without getting too technical!