Update 9/10/24: Venture cards have been updated and they look awful. Well done Capital One.
Original post: Over the next few months Capital One plans to redesign all of their credit cards. This is a cosmetic change with cards going for a more simplified look similar to the new Capital One Quicksilver card design.
My suspicion is that this will be done alongside new cards launching and increased sign up bonuses, but this could be done independently of each other.
Hat tip to Silkychurn