It will just be internal wallet maintenance at Bittrex, nothing maidsafe are doing affects MAIDs, they are just a holder token for the real SAFEcoins when they emerge.
DO NOT store your coins on an exchange. Especially if it is a decent sum of money. MAID are an ‘omni asset’ which means they are stored on the bitcoin blockchain. You can create a key pairing at somewhere like bitaddress.org, then send your MAID (along with a small amount of BTC to cover fees next time - $5ish) to the public key. Store the private key on paper ONLY, never store your private keys online and never leave your coins on an exchange.
When it comes time to move your MAID from that private key you can create a wallet at omniwallet, go to ‘addresses/import address with private key’ type in your private key and bob’s your uncle, your maid and the bit of BTC will be in your omni wallet ready to send on wherever you want. Iz simples, as the meerkats say