If you want to make your animated gifs even smaller, run the individual frames through a tool like Jpegmini. If you use a minimizer like that first (in addition to saving for web in Photoshop, too, of course) it’s often possible to cut the size of an animated gifs down to one third of its original size. That can make the difference between having animated gifs be a viable or unrealistic technique.
One of the foundational pieces of successful video marketing is to avoid going in for the hard sell. Videos can be really effective and fruitful in creating relationships between your leads and your brand, in fact, 90% of users say video is helpful in their decision process. but not if you’re constantly pushing the viewer to buy. (Think cheesy infomercial -- You don’t want to be that guy.)
If you can explain a new feature with an animated gif, you could send them in customer support emails to explain how to solve customers’ most common problems. Some SAAS companies actually give all their customer service people access to the screen capture app Jing. When a customer has a problem, the customer service people just make a 1-2 minute video explaining how to do what the customer wants. They send the video. This saves writing long explanations, and is more helpful to the customers.
So what's the take-away here? It’s probably still a year or more until HTML5 video in emails is more widely used. Some of the bravest email marketers might leap in now, like Chanel did with this HTML5 email that StyleCampaign created, but those will be the exception. Again, what really matters for your results is which email clients your list uses most. It’s a good idea to check your email analytics to see which email clients your subscribers use. Who knows, you might actually see an opportunity for some video testing.