What (new) skills do product marketers need today that they didn’t need 3 years ago?

Over the past few years (and continuing), it's become more important that product marketers have technical depth in the areas they cover. Being able to go deep in your area will make your messaging better and will help you better identify what are the right topics and tactics necessary to land in the market. This will also make you a more valuable partner to PM, and can open doors to helping with betas and influencing roadmap.

You also need to be able to understand data. This ranges from being able to work with data science and analytics teams and clearly communicate what questions you need to answer, to having the ability to dig into data yourself to identify trends and adjust queries.