We know that at least one Cinema EOS camera will be replaced ahead of NAB 2018 next month, and the best is that we'll see a Cinema EOS C100 Mark III, though we haven't received full confirmation as of yet.
An unknown source has told us that we'll be seeing a 4K capable C100 Mark III for NAB 2018 in April. No other specifications have been sent to us.
We also know that a non cinema EOS camera is also coming for NAB, and that it's not a new DSLR. More information on this shortly.
Take this with a grain of salt until we raise the rating of the information.