Dubbed the RC213V, the bike was revealed at Repsol's Madrid headquarters.
2013 marks the 19th year of the Japanese marque's partnership with the oil giant.
HRC executive vice president Shuhei Nakamoto confirmed the bike was not a radical redesign but rather an evolution of the model that it brought to Laguna Seca mid-way through last year's championship.
Although Jorge Lorenzo captured the 2012 riders' title, Honda easily beat Yamaha in the constructors' race.
It had also claimed the championship in 2011, ending a run of four straight years of defeats in the teams' standings.
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- Shuhei Nakamoto