Big thanks to the Bittrex Support staff, we now have a confirmed date for our upcoming $GEO swap. 
https://support.bittrex.com/hc/en-us/articles/115003177652
https://support.bittrex.com/hc/en-us/articles/115003177652
i have almost 1000 geocoin available in bittrex. do i have to do anything or i will get another 1000 geocoin in 26.01.2018 ? tell me plz.
Yes you will get exactly the same amount 1000 Geocoin! but from 26th it will be a ERC20 token on the Ubiq blockchain.
You will need a UBIQ wallet after 26th December if you want to withdraw $GEO - https://ubiqsmart.com/
mean: bittex automatic swap my geo on bittrex with get another geocoin, and after 26.01.2018, i have new 1000 geo on bittrex and can exchange it?
Yes, as soon as Bittrex re enables trading after the swap on 26.01.2018 you will be able to exchange it or withdraw to Ubiq wallet