It's probably not hard to guess what this is. The Yars mobile strategic ICBM missile system will enter Red Square during the parade, accompanied by foliage remote-clearance mine vehicles. The clearance vehicle uses powerful microwaves to literally burn away high-explosives mines, and as you can image, it will not be demonstrated during the parade.
The ICBM launcher will merely roll though as well, utilising an 800-bhp engine to carry its massive multi-stage intercontinental ballistic missile. According to some reports, about 200 of these mobile units protect the country.