According to a tweet by Kidani Takaaki, president of Fujiroad, the anime "Cardfight!! Vanguard
" will continue after the current 3rd season ends. He promises that it will go to at least a season 5. Fujiroad makes the card game "Cardfight!! Vanguard" and Kidani is credited as the Chief Producer for the anime.
Source: Kidani's tweet
Story by ShiroiRyu