SVG support (finally) arriving is great news; though I don’t think there’s any inherent SEO value to the format just because it’s text-based.

SVGs might actually be bad for SEO, depending on your context. For example, with complex (inline) SVGs, you can end up with a ton of raw XML content in your document which adds overhead (to transfer, and to rendering). I’ve also seen folks use SVGs in weird ways – particularly when they include text or HTML content – which can cause all sorts of SEO headaches.

However, loading an SVG as a conventional image (e.g., via an element with an src attribute) isn’t really any different to any other format.

That said, they can also be great for saving bytes on, e.g., simple illustrations!