Does someone know the current exchange rate of Blackbyte, if any?
Well you can go to #trading_blackbyte on Slack and see what's happening there, sellers and buyers do not seem to agree

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the end of the second round will be mid February, then the BB wallet and our Btc synchronization will be snap shooted only in that date?
The exact date will be announced later, for now we only have mid-Feb and yes there will be only one snapshot.
afterwords we are able to move again our Btc without any problems?
Yes. Your funds have to be there for the snapshot, you are neither obliged to have them now nor to leave them there after.
thx in advance
You are welcome

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