Yep - cadence will improve - ideally to the range of 85-100rpm. I find my turbo cadence (95-110) is higher than my road cadence (93-100). Doesn’t really matter provided your not grinding your patella into the dust at less than 80rpm for a regular amount of time. I do agree with the VO2 max comments though - you need to really floor it just as the interval starts and get the cadence up to 110-120rpm as these are supposed to tax your oxygen uptake not your muscles…I know when the man with the hammer is about to hit me when my VO2 max rpm drops below 110! (usually the arse end of 3 min intervals @120%!) 
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