That's a good call. We'll manage to turn on SVG support before reaching the 1.0 release. Being as iOS 2.1+ WebKit supports SVG as do most other WebKit browsers, it is a great idea to support (and encourage the use of) this format for animations that will look great on different displays and resolutions.
A workaround is to import a version of the image that is equal to the highest scale you want to display, then scaling the image down for all other parts of your animation.