How can we ensure that the sales team feels motivated and inspired by the product updates?

Slight nuance here but I don't think sales teams feel motivated and inspired by "product updates." In my career, I've seen many PMM teams that push product updates to sales teams and consider it their job to make sure sales always has the latest features in their toolkit. You may reading this and thinking the same thing. But what I hear from Sales around product updates is they're noisy. PMMs need to start with more empathy for what it means to be a seller. They have to hit quota (which is hard) and they don't have time for any distractions. How do you move product updates out of the "distraction" category?

You have to nest the features in the problems they're trying to solve today. What are the key sales conversations happening every day? Where are they losing deals and why? Create a framework for these updates that nests the innnovation under key buyer themes. Maybe even change the name "product updates" to "product innovation for your next customer call." And the last thing I'd recommend is packaging updates and doing them less often. If the sales team understands when to expect this and how often, they're more likely to make it part of a habit. If updates are done adhoc or too often, they feel like noise.