Could mean something, could mean nothing. Nintendo reportedly asking developers to make 4K compatible games for the rumored next gen. Switch.
Worth noting this comes from Bloomberg, which has reported the rumor of a graphically better/ performance boosted switch since its release
Nintendo Reportedly Asking Developers to Make 4K-Ready Games, Suggesting Switch Upgrade - IGN
My guess is the "Switch Pro" or whatever wont come in the form of a new Switch, rather a bulkier dock with a better processing power and graphics chip at around $150 with a firmware update to go along with current switch owners so that they aren't left out.
Also worth noting a patent for individual joy cons with no attachment rails has been trademarked by Nintendo.