I take all the predictions of an upcoming Russian/Rebel offensive with a huge grain of salt. Notice that all these "predictions" are coming from the Ukrainian government and are then parroted by NATO as gospel.
Many in the Ukrainian government do not want the Minsk ceasefire to work and are still pressing the US/EU for weapons and additional sanctions so they can continue the war and recapture East Ukraine.
Putin basically has what he wants, a "frozen conflict", no foreseeable entry of Ukraine in the EU/NATO, Crimea back in Russia. There is no need to continue the offensive westward.
Of course, I could be wrong, Putin is unpredictable.
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