Universal Credit only replaces Income Related benefits such as ESA(IR) so you will not be moved to UC, however, because UC forces a split of ESA into Income and non-Income Related claims there is also a "UC" equivalent to ESA(CB) call New Style ESA, it is still unclear whether ESA(CB) claimants will be moved across to this.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems