Highlight the key benefits of the new product in the subject line and preview text. This will catch readers' attention and convey why they should care.
Create a sense of urgency and exclusivity: Use copy that creates a sense of urgency and exclusivity, such as early-bird deals or limited-time offers
Make it easy to learn more and buy with clear call-to-action buttons. Send traffic to a tailored landing page, not just the generic product page.
Segment your list and customize emails, especially for top customers or prospects. Address their specific needs/interests and tailor content accordingly.
Lastly, include contact info for questions and stay involved and communicative with your customers to be!